refactor: simplify tuple declaration in ValidateCopyOperation call

Author: clFaster

src/SVNPathCopy.ShellExtension/SvnPathCopyContextMenu.cs

@@ -97,7 +97,7 @@ private void CopySvnPath(bool withRevision)
             var settings = _configService.GetSettings();
 
             // Validate the operation
-            (var isValid, var errorMessage) = svnService.ValidateCopyOperation(
+            var (isValid, errorMessage) = svnService.ValidateCopyOperation(
                 path,
                 withRevision
             );