[BUGFIX] Use sort number instead of just 0 for first position in column

This should be solved for elements in page columns as well as in containers

Change-Id: I2bc8c5a5cb3862cf6a11364438a1bcd04b07da31
Resolves: #60328
Reviewed-on: http://review.typo3.org/31810
Reviewed-by: Jo Hasenau <info@cybercraft.de>
Tested-by: Jo Hasenau <info@cybercraft.de>