Update octopi.txt without raspicam mentions

If necessary, see discussion in guysoft/OctoPi#796

scripts/81-fix-octopi-txt

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+set -x
+set -e
+
+export LC_ALL=C
+
+source /common.sh
+install_cleanup_trap
+
+# if input_raspi.so is there, we don't need to do anything
+[ -f /opt/mjpg-streamer/input_raspi.so ] && exit 0
+
+# if we already have the octopi.txt file updated, we don't need to do anything
+grep -q '### Configure which camera to use' /boot/octopi.txt || exit 0
+
+cp /files/octopi.txt /boot/octopi.txt

scripts/files/octopi.txt

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+### Windows users: To edit this file use Notepad++, VSCode, Atom or SublimeText.
+### Do not use Notepad or WordPad.
+
+### MacOSX users: If you use Textedit to edit this file make sure to use 
+### "plain text format" and "disable smart quotes" in "Textedit > Preferences"
+
+### Heads-up: The "input_raspicam" input module of mjpg-streamer is no longer supported.
+### Raspicam support is now available on the "input_uvc" module.
+
+### Additional options to supply to MJPG Streamer for the USB camera
+#
+# See https://faq.octoprint.org/mjpg-streamer-config for available options
+#
+# Defaults to a resolution of 640x480 px and a framerate of 10 fps
+#
+#camera_usb_options="-r 640x480 -f 10"
+
+### Additional webcam devices known to cause problems with -f
+#
+# Apparently there a some devices out there that with the current 
+# mjpg_streamer release do not support the -f parameter (for specifying 
+# the capturing framerate) and will just refuse to output an image if it 
+# is supplied.
+#
+# The webcam daemon will detect those devices by their USB Vendor and Product
+# ID and remove the -f parameter from the options provided to mjpg_streamer.
+#
+# By default, this is done for the following devices:
+#   Logitech C170 (046d:082b)
+#   GEMBIRD (1908:2310)
+#   Genius F100 (0458:708c)
+#   Cubeternet GL-UPC822 UVC WebCam (1e4e:0102)
+#
+# Using the following option it is possible to add additional devices. If
+# your webcam happens to show above symptoms, try determining your cam's
+# vendor and product id via lsusb, activating the line below by removing # and 
+# adding it, e.g. for two broken cameras "aabb:ccdd" and "aabb:eeff"
+#
+#   additional_brokenfps_usb_devices=("aabb:ccdd" "aabb:eeff")
+#
+# If this fixes your problem, please report it back so we can include the device
+# out of the box: https://github.com/guysoft/OctoPi/issues
+#
+#additional_brokenfps_usb_devices=()
+
+### Configuration of camera HTTP output
+#
+# Usually you should NOT need to change this at all! Only touch if you
+# know what you are doing and what the parameters mean.
+#
+# Below settings are used in the mjpg-streamer call like this:
+#
+#   -o "output_http.so -w $camera_http_webroot $camera_http_options"
+#
+# Current working directory is the mjpg-streamer base directory.
+#
+#camera_http_webroot="./www-octopi"
+#camera_http_options="-n"
+
+# Configuration of network monitoring
+#
+# This enables network monitoring for wifi connections with a simple ping test.
+# If connection terminates by variable reasons system tries to restart the wifi connection to reestablish a connection.
+# The connection test is done every minute.
+# By default it is disabled (0 = off / 1 = on)
+# destination_host can be an ip address or a hostname (for hostname ensure dns resosultion is working correctly)
+enable_network_monitor=0
+destination_host=192.168.1.1
+
+### EXPERIMENTAL
+# Support for different streamer types.
+#
+# Available options:
+#   mjpeg [default] - stable MJPG-streamer
+#   hls - experimental FFMPEG HLS streamer
+#camera_streamer=mjpeg