synedit: fixed function result TSynEditStringsLinked.EditReplace

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39847 4005530d-fff6-0310-9dd1-cebe43e6787f
synedit: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39848 4005530d-fff6-0310-9dd1-cebe43e6787f