[BUGFIX] Always add wrapping div if dividers2tabs is disabled

TCEforms is not wrapped in a div when dividers2tabs is disabled 
and a inline-element form element is present. As a result there 
is no background image/color shown.

This changes removes the check as the wrap is also needed when
inline-elements are present.

Resolves: #59163
Releases: 6.2
Change-Id: I8772fce0d99bacdf18692308c700c02c0a0defcf
Reviewed-on: https://review.typo3.org/30461
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Kay Strobach
Tested-by: Kay Strobach
Reviewed-by: Frans Saris
Tested-by: Frans Saris