Fix best size computation for wxTextCtrl without borders in wxMSW.

Fix best size computation for wxTextCtrl without borders in wxMSW.

wxTextCtrl with wxBORDER_NONE (and possibly wxTE_READONLY) style is often used
instead of a wxStaticText to allow copying the text, so make the size of such
control the same as size of the label. This ensures that it aligns correctly
with the label vertically while before the baselines were not aligned because
a border-less text control was rendered by MSW as a label but had a too big
size.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69066 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775