[BUGFIX] PageLayoutView: Removed call to deprecated method render()

Call of FlashMessage->render() was replaced with appropriate code if
*CType 'list' list_type has invalid value
*CType not defined

Resolves: #73638
Releases: master, 7.6
Change-Id: Ic6342e8eae8bace4d855d6471dd2ccefd339efc1
Reviewed-on: https://review.typo3.org/46867


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>