[BUGFIX] Correctly handle whitespace in format.date VH

Child content may contain line breaks or other whitespace.
Trim the content before processing it.

Resolves: #72152
Releases: master
Change-Id: Ibf5d3fb2c5ca74bb045c4278f0852c47e2131eab
Reviewed-on: https://review.typo3.org/45200


Reviewed-by: Felix Rauch <rauch@skaiamail.de>
Tested-by: Felix Rauch <rauch@skaiamail.de>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>