mailmap: Sanatise to @fvwm.org where applicable

For Thomas Adam's mail entries, sanatise the email addresses to @fvwm.org

.mailmap

@@ -11,6 +11,7 @@ Olivier Chapuis <olivier.chapuis@free.fr> olicha <olicha>
 Paul D. Smith <pausmith@nortelnetworks.com> psmith <psmith>
 Renato Caldas <seventhguardian@gmail.com> renato <renato>
 Scott Smedley <ss@aao.gov.au> scott <scott>
+Thomas Adam <thomas@fvwm.org> Thomas Adam <thomas@xteddy.org>
 Thomas Adam <thomas@fvwm.org> tadam <tadam>
 Thomas Funk <t.funk@web.de> tfunk <tfunk>
 Viktor Griph <griph@dd.chalmers.se> griph <griph>