lazdatadesktop: remove unused XPM files

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43111 4005530d-fff6-0310-9dd1-cebe43e6787f
lazdatadesktop: use FPC resources

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43112 4005530d-fff6-0310-9dd1-cebe43e6787f