all: only use one fallback method for dbs

Only use fallbackToDestructiveMigration for all databases.

I thought you had to selectively enable downgrading as well, but
apparently that disables other destructive migrations. This was not
obvious at all and caused countless issues. Absolutely flooring.

app/src/main/java/org/oxycblt/auxio/music/cache/CacheModule.kt

@@ -43,7 +43,6 @@ class CacheRoomModule {
         Room.databaseBuilder(
                 context.applicationContext, CacheDatabase::class.java, "music_cache.db")
             .fallbackToDestructiveMigration()
-            .fallbackToDestructiveMigrationOnDowngrade()
             .build()
 
     @Provides fun cachedSongsDao(database: CacheDatabase) = database.cachedSongsDao()

app/src/main/java/org/oxycblt/auxio/music/user/UserModule.kt

@@ -43,7 +43,5 @@ class UserRoomModule {
         Room.databaseBuilder(
                 context.applicationContext, UserMusicDatabase::class.java, "user_music.db")
             .fallbackToDestructiveMigration()
-            .fallbackToDestructiveMigrationFrom(0)
-            .fallbackToDestructiveMigrationOnDowngrade()
             .build()
 }

app/src/main/java/org/oxycblt/auxio/playback/persist/PersistenceModule.kt

@@ -45,8 +45,6 @@ class PersistenceRoomModule {
                 PersistenceDatabase::class.java,
                 "playback_persistence.db")
             .fallbackToDestructiveMigration()
-            .fallbackToDestructiveMigrationFrom(1)
-            .fallbackToDestructiveMigrationOnDowngrade()
             .build()
 
     @Provides fun playbackStateDao(database: PersistenceDatabase) = database.playbackStateDao()