data/lua: Add event.set_always_log_source()

This was forgotten earlier.

Author: sirainen

data/lua.js

@@ -399,6 +399,12 @@ If header is not found from the response, an empty string is returned.`
 		text: `Append prefix for log messages.`
 	},
 
+	{
+		name: 'set_always_log_source',
+		tags: [ 'event', 'event_passthrough' ],
+		text: `Add source path:line to the log messages.`
+	},
+
 	{
 		name: 'set_name',
 		args: {