Fix Unicode key code for Ctrl-letter in wxGTK.

This was broken by changes in r69892 and just the letter was used as the key
code instead of Ctrl-letter as it used (and should) be.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69957 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -974,7 +974,7 @@ gtk_window_key_press_callback( GtkWidget *WXUNUSED(widget),
                 if ( wxIsUpperChar(key_code) )
                     eventChar.m_keyCode = key_code - 'A' + 1;
 #if wxUSE_UNICODE
-                eventChar.m_uniChar = event.m_keyCode;
+                eventChar.m_uniChar = eventChar.m_keyCode;
 #endif
             }