Adjust source-api R8 rules (#8064)

source-api/consumer-proguard.pro

@@ -1,5 +1,5 @@
--keep,allowoptimization class eu.kanade.tachiyomi.source.model.** { public protected *; }
--keep,allowoptimization class eu.kanade.tachiyomi.source.online.** { public protected *; }
+-keep class eu.kanade.tachiyomi.source.model.** { public protected *; }
+-keep class eu.kanade.tachiyomi.source.online.** { public protected *; }
 -keep class eu.kanade.tachiyomi.source.** extends eu.kanade.tachiyomi.source.Source { public protected *; }
 
 -keep,allowoptimization class eu.kanade.tachiyomi.util.JsoupExtensionsKt { public protected *; }