Needs to add ocfDeviceType: 'oic.d.garagedoor' to definition

[xyxzxyz]

Icon will show as contact sensor by default, adding ocfDeviceType: 'oic.d.garagedoor' to definition will change device icon to a garage door instead of a contact sensor.

line would look like this
definition (name: "MimoLite Garage Door Controller", namespace: "smartthings", author: "Todd Wackford", ocfDeviceType: 'oic.d.garagedoor')

source:
https://community.smartthings.com/t/change-icons-in-new-app/184190/25
https://community.smartthings.com/t/change-icons-in-new-app/184190/45
https://community.smartthings.com/t/change-icons-in-new-app/184190/55