[BUGFIX] Refine new styling of page module

* Show all edit icons of a column if hovering over
  the column.

Resolves: #43208
Releases: 6.0

Change-Id: I9107e8324392a6e703426f6f7fc392c950fa91d2
Reviewed-on: http://review.typo3.org/16727
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel