[BUGFIX] Some TCEforms elements are displaced

When a TCEforms field is part of a palette, a specific span tag
is added around it. A similar span tag must be added around fields
which are not part of a palette, so that we have similar behaviors.

Change-Id: If13c130423c4839b89c7f03e015feffd8ae3bd94
Resolves: #29029
Related: #28030
Releases: 4.6, 4.5
Reviewed-on: http://review.typo3.org/4390
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Susanne Moog
Tested-by: Susanne Moog