Avoid harmless MSVC shadowing warning in the test

Using "argc" and "argv" for parameter names triggers C4458 with MSVS
2022, warning about hiding class members with the same names.

As we can't rename the latter, rename the parameters to avoid this.

tests/test.cpp

@@ -364,10 +364,10 @@ public:
         return !wxGetEnv(wxASCII_STR("WX_TEST_DISABLE_GUI"), nullptr);
     }
 
-    virtual bool Initialize(int& argc, wxChar **argv) override
+    virtual bool Initialize(int& argcIn, wxChar **argvIn) override
     {
-        return IsGUIEnabled() ? wxApp::Initialize(argc, argv)
-                              : wxAppConsole::Initialize(argc, argv);
+        return IsGUIEnabled() ? wxApp::Initialize(argcIn, argvIn)
+                              : wxAppConsole::Initialize(argcIn, argvIn);
     }
 
     virtual bool OnInitGui() override