lcl: load button icons from FPC resources instead of Lazarus resources

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42957 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL, fix ValueListEdit not showing key column at runtime, issue 24780

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42958 4005530d-fff6-0310-9dd1-cebe43e6787f