fix: bad condition to check if auto-fetch is enabled (sourcegit-scm#2257)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/ViewModels/Repository.cs

@@ -1887,7 +1887,7 @@ private async Task AutoFetchOnUIThread()
 
             try
             {
-                if (Preferences.Instance.EnableAutoFetch || !CanCreatePopup())
+                if (!Preferences.Instance.EnableAutoFetch || !CanCreatePopup())
                 {
                     _lastFetchTime = DateTime.Now;
                     return;