Another compilation fix to wxMimeTypesManager, this time in Unicode build.

Fix another problem introduced by backporting the fix from the trunk in
r63936.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@63971 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/mimetype.cpp

@@ -1532,9 +1532,9 @@ void wxMimeTypesManagerImpl::InitIfNeeded()
         {
             wxString wm = traits->GetDesktopEnvironment();
 
-            if ( wm == "KDE" )
+            if ( wm == wxT("KDE") )
                 mailcapStyles = wxMAILCAP_KDE;
-            else if ( wm == "GNOME" )
+            else if ( wm == wxT("GNOME") )
                 mailcapStyles = wxMAILCAP_GNOME;
             //else: unknown, use the default
         }