change PRIORITY for Synchronize

iOSClient/Synchronize/CCSynchronize.m

@@ -100,7 +100,7 @@
     
     (void)[[NCManageDatabase sharedInstance] addMetadata:metadataFolder];
     
-    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
         
         tableAccount *recordAccount = [[NCManageDatabase sharedInstance] getAccountActive];