Merge pull request #2159 from DaPa/master

Avoid SQLite connection object leaking

app/src/main/kotlin/com/simplemobiletools/gallery/pro/databases/GalleryDatabase.kt

@@ -44,6 +44,9 @@ abstract class GalleryDatabase : RoomDatabase() {
         }
 
         fun destroyInstance() {
+            if (db?.isOpen == true) {
+                db?.close()
+            }
             db = null
         }