[BUGFIX] Wrong top/bottom margin rendering in CSC

When a top or bottom margin has been chosen together with section_frame
"no frame" -> 66, no entry is made in the temporary stylesheet.

This patch solves this issue by changing the stdWrap variable to
classStdWrap for the method renderSpace().

Change-Id: Iee6c98537e2a4a8c917dfd450289f26ce50e3ca9
Fixes: #47403
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/20155
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack
Reviewed-on: https://review.typo3.org/21787