Undo mimicking faulty wxDC::DrawLabel() wxALIGN_RIGHT positioning

Revert b642747fd2 (Fix right aligned text position in wxDVC on MSW with
system theme, 2015-09-30) which in wxRendererXP::DrawItemText() mimicks
the off-by-one with right alignment of wxDC::DrawLabel() that got fixed
by the previous commit.

There's not a similar change copying wxDC::DrawLabel()'s former
off-by-one behaviour with wxALIGN_BOTTOM that would need reverting.

Both alignments now result in the same text positioning with both
drawing functions.

src/msw/renderer.cpp

@@ -1093,10 +1093,7 @@ void wxRendererXP::DrawItemText(wxWindow* win,
         if ( align & wxALIGN_CENTER_HORIZONTAL )
             textFlags |= DT_CENTER;
         else if ( align & wxALIGN_RIGHT )
-        {
             textFlags |= DT_RIGHT;
-            rc.right--; // Alignment is inconsistent with DrawLabel otherwise
-        }
         else
             textFlags |= DT_LEFT;