Revert "[BUGFIX] Nested FLUIDTEMPLATE doesn't work anymore"

This reverts commit 1ba19b02542087ee2f26407be28d938d663c17a4

The Unit-test breaks because it is based on a FEATURE that
has been merged in 6.1, 
commit 17ba001ccaec73a90b499de19d1aeefc74242b44

Change-Id: If1fec2c489bc1258716171236165f9ce388559e4
Reviewed-on: https://review.typo3.org/21552
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters