Disable database destructive migration fallback

This really shouldn't be enabled, as this database is not just a temp
one. Making the mistake of shipping the app without a proper migration
would cause a big problem.

Really hard to happen but an error is far better than data loss.

app/src/main/java/org/schabi/newpipe/NewPipeDatabase.java

@@ -23,7 +23,6 @@ public final class NewPipeDatabase {
         return Room
                 .databaseBuilder(context.getApplicationContext(), AppDatabase.class, DATABASE_NAME)
                 .addMigrations(MIGRATION_11_12)
-                .fallbackToDestructiveMigration()
                 .build();
     }