FEXQonfig: Fix false "Failed to load config file" error when saving to a new file

Source/Tools/FEXQonfig/main.qml

@@ -72,7 +72,9 @@ ApplicationWindow {
         }
 
         onAccepted: {
-            root.selectedConfigFile(selectedFile)
+            if (!isSaving) {
+                root.selectedConfigFile(selectedFile)
+            }
             configFilename = selectedFile
             if (onNextAccept) {
                 onNextAccept()