Module launcher icons are not adaptive

[mmathieum]

Unlike the main app, the modules don't have adaptive icons.

It looks outdated on recent Android OS/devices:

We need to have re-usable foregrounds for all route types that includes the route type img and MonTransit logo.

For the background it should be the like the poi_agency_color with the # in the beginning.

Links:

• https://github.com/mtransitapps/commons-android/blob/master/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
• https://developer.android.com/develop/ui/views/launch/icon_design_adaptive