fix: app crashes when close a repository on read-only drive (#1080)

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

src/ViewModels/Repository.cs

@@ -518,7 +518,7 @@ namespace SourceGit.ViewModels
             {
                 File.WriteAllText(Path.Combine(_gitDir, "sourcegit.settings"), settingsSerialized);
             }
-            catch (DirectoryNotFoundException)
+            catch
             {
                 // Ignore
             }