delete invalid DB files in batches, not one by one

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/MainActivity.kt

@@ -970,15 +970,20 @@ class MainActivity : SimpleActivity(), DirectoryOperationsListener {
                     }.start()
                 }
 
+                if (!directory.isRecycleBin()) {
                     getCachedMedia(directory.path, getVideosOnly, getImagesOnly) {
+                        val mediaToDelete = ArrayList<Medium>()
                         it.forEach {
                             if (!curMedia.contains(it)) {
-                            val path = (it as? Medium)?.path
+                                val medium = it as? Medium
+                                val path = medium?.path
                                 if (path != null) {
-                                deleteDBPath(path)
+                                    mediaToDelete.add(medium)
                                 }
                             }
                         }
+                        mediaDB.deleteMedia(*mediaToDelete.toTypedArray())
+                    }
                 }
             }