Updated DBSyncWatcher

Changed from Doing a for loop, to just returning, as we don't want to
propogate the signal if we are syncing.

FreeTubeSyncer/Library/DBSyncWatcher.cs

@@ -36,10 +36,7 @@ public class DBSyncWatcher
     {
         if (e.ChangeType != WatcherChangeTypes.Changed) return;
 
-        while (Locked)
-        {
-            Thread.Sleep(100);
-        }
+        if (Locked) return;
 
         var dbName = Path.GetFileName(e.FullPath);