fix: OpenFolderPickerAsync raise exception when selected a drive root such as E:\

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

src/Commands/FormatPatch.cs

@@ -6,6 +6,7 @@
         {
             WorkingDirectory = repo;
             Context = repo;
+            Editor = EditorType.None;
             Args = $"format-patch {commit} -1 --output=\"{saveTo}\"";
         }
     }