HIG fixes for basctl

And a menu item and dialog rename: Goto Line (Number) →  Go to Line

Change-Id: I5889486ddd7925a9ade889787889a9b9b6221f39
Reviewed-on: https://gerrit.libreoffice.org/12971
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>