Custom queries: buttons to move column to top and bottom (#16326).

git-svn-id: http://svn.redmine.org/redmine/trunk@12991 e93f8b46-1217-0410-a6f0-8f06a7374b81
Set same width for all buttons (#16326).

git-svn-id: http://svn.redmine.org/redmine/trunk@12992 e93f8b46-1217-0410-a6f0-8f06a7374b81