Revert ktlint update, unrevert Gradle and PR build workflow reverts (#3681)

app/src/main/java/eu/kanade/tachiyomi/data/cache/ChapterCache.kt

@@ -9,13 +9,13 @@ import eu.kanade.tachiyomi.data.database.models.Chapter
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.util.storage.DiskUtil
 import eu.kanade.tachiyomi.util.storage.saveTo
+import java.io.File
+import java.io.IOException
 import okhttp3.Response
 import okio.buffer
 import okio.sink
 import rx.Observable
 import uy.kohesive.injekt.injectLazy
-import java.io.File
-import java.io.IOException
 
 /**
  * Class used to create chapter cache