Fix/foreground permissions scanning (#556)

* try catch the foreground location service if not available

* ask for background permissions

* background permissions in onboarding

* small improvements

app/src/main/java/com/bitchat/android/onboarding/OnboardingState.kt

@@ -6,8 +6,9 @@ enum class OnboardingState {
     LOCATION_CHECK,
     BATTERY_OPTIMIZATION_CHECK,
     PERMISSION_EXPLANATION,
+    BACKGROUND_LOCATION_EXPLANATION,
     PERMISSION_REQUESTING,
     INITIALIZING,
     COMPLETE,
     ERROR
-}
+}