Don't intercept accelerators in wxTextValidator in wxGTK.

Key events with modifiers shouldn't be filtered by the validator as they are
used as accelerators and not for the text entry at all.

Closes #15777.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75453 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -15,6 +15,10 @@ All (GUI):
 - Add wxHtmlWindow::SetDefaultHTMLCursor() (Jeff A. Marr).
 - Add default ctor and Create() to wxContextHelpButton (Hanmac).
 
+wxGTK:
+
+- Don't intercept accelerators in wxTextValidator.
+
 wxMSW:
 
 - Make wxFILTER_INCLUDE_LIST in wxTextValidator actually usable.