Set wild card in the base class too in wxGTK wxFileDialog.

Calling wxFileDialogBase::SetWildcard() ensures that GetWildcard() returns the
correct value after wxFileDialog::SetWildcard() was called.

The new code will also work correctly if we change SetWildcard() to handle
empty wildcard as the default one (see #12079).

Closes #12080.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64381 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/filedlg.cpp

@@ -433,12 +433,12 @@ wxString wxFileDialog::GetFilename() const
 
 void wxFileDialog::SetWildcard(const wxString& wildCard)
 {
-    m_fc.SetWildcard( wildCard );
+    wxFileDialogBase::SetWildcard(wildCard);
+    m_fc.SetWildcard( GetWildcard() );
 }
 
 void wxFileDialog::SetFilterIndex(int filterIndex)
 {
-
     m_fc.SetFilterIndex( filterIndex);
 }