Fix mismatched malloc/delete in wxQt wxApp

m_qtArgv elements are allocated using wxStrdupA(), so must be free()d
and not deleted.

Closes https://github.com/wxWidgets/wxWidgets/pull/1363

src/qt/app.cpp

@@ -28,7 +28,7 @@ wxApp::~wxApp()
     // Delete command line arguments
     for ( int i = 0; i < m_qtArgc; ++i )
     {
-        delete m_qtArgv[i];
+        free(m_qtArgv[i]);
     }
 }