cocoa: fix formatting

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43667 4005530d-fff6-0310-9dd1-cebe43e6787f
Set TColortoTGdkRGBA alpha to 1 by default

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43668 4005530d-fff6-0310-9dd1-cebe43e6787f