tests: added test for removing unit from all uses sections

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42858 4005530d-fff6-0310-9dd1-cebe43e6787f
codetools: fixed removing first unit from second line

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42859 4005530d-fff6-0310-9dd1-cebe43e6787f