[BUGFIX] Log date picker broken

The date picker in the Admin Tools > Log when selecting a user-defined
time range is broken. Adapt it to new skinning API for the JS to act
on it properly again.

Change-Id: I8471eff878015dd2ff078921b6947a3beae8d25f
Resolves: #31450
Releases: 4.7, 4.6, 4.5, 4.4
Reviewed-on: http://review.typo3.org/6560
Reviewed-by: Francois Suter
Tested-by: Francois Suter