Use wxString::t_str() in calls to Windows API functions in wxMSW.

Use t_str() instead of wx_str() to make the code work correctly in UTF-8 build
in which wx_str() returns a pointer to UTF-8 buffer while we need a wchar_t
pointer for Windows.

Closes #14371.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71640 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/textentry.cpp

@@ -625,7 +625,7 @@ wxTextEntry::~wxTextEntry()
 
 void wxTextEntry::WriteText(const wxString& text)
 {
-    ::SendMessage(GetEditHwnd(), EM_REPLACESEL, 0, (LPARAM)text.wx_str());
+    ::SendMessage(GetEditHwnd(), EM_REPLACESEL, 0, wxMSW_CONV_LPARAM(text));
 }
 
 wxString wxTextEntry::DoGetValue() const