feat(usersettings): add separate setting for streaming region (#993)

* feat: add separate setting for streaming region

Currently, the "Currently Streaming On" information is based on the Discover Region setting. This PR
adds a new setting to specify which region should be used to display the streaming region.

re #890

* fix: add missing newline

* fix: rename migration function

src/context/SettingsContext.tsx

@@ -16,7 +16,8 @@ const defaultSettings = {
   localLogin: true,
   movie4kEnabled: false,
   series4kEnabled: false,
-  region: '',
+  discoverRegion: '',
+  streamingRegion: '',
   originalLanguage: '',
   mediaServerType: MediaServerType.NOT_CONFIGURED,
   partialRequestsEnabled: true,