Auto adjust column width in remote control add_tags table.
(noticed by CupIvan) Method TableHelper.adjustColumnWidth(table, column, maxColumnWidth) can also be used in any other place of code

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5784 0c6e7542-c601-0410-84e7-c038aed88b3b