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

server/entity/UserSettings.ts

@@ -31,7 +31,10 @@ export class UserSettings {
   public locale?: string;
 
   @Column({ nullable: true })
-  public region?: string;
+  public discoverRegion?: string;
+
+  @Column({ nullable: true })
+  public streamingRegion?: string;
 
   @Column({ nullable: true })
   public originalLanguage?: string;