[iOS] Missing plist/location properties in positioning examples

Only weatherinfo positioning example has the 'location permission key' needed to access the location services on iOS.

These examples should likely have them, and with slightly different keys on macOS/iOS, and a slightly different plist file for qmake/cmake:

weatherinfo
geoflickr

The keys can be seen here.

The keys are identical for those example apps => the plist files should be shared across them.