[BUGFIX] Resetting of input field to default when having a range fails

When trying to reset a endtime (datetime or date) having a range (like tt_news
articles) the lower range limit will be stored instead of the default value.

Change-Id: Ib9947ddc147aa62ca4136301f2e4fcce6917d9a8
Fixes: #28298
Releases: 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/7624
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Tolleiv Nietsch
Tested-by: Tolleiv Nietsch