Create wxStaticText with correct label directly in wxTextSizerWrapper.

This is shorter and arguably more clear than doing it in two steps as we did
before and also works in wxUniv, unlike creating wxStaticText with empty label
and setting it later.

Closes #13858.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70433 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/textwrapper.h

@@ -98,9 +98,8 @@ public:
 protected:
     virtual wxWindow *OnCreateLine(const wxString& line)
     {
-        wxStaticText* const win = new wxStaticText(m_win, wxID_ANY, "");
-        win->SetLabelText(line);
-        return win;
+        return new wxStaticText(m_win, wxID_ANY,
+                                wxControl::EscapeMnemonics(line));
     }
 
     virtual void OnOutputLine(const wxString& line)