[BUGFIX] EXT:form - fix values with dots within form editor

Fix JavaScript errors if "properties.options" array keys contain dots.

Resolves: #80197
Resolves: #82210
Resolves: #81961
Resolves: #82186
Releases: master, 8.7
Change-Id: Idfa976bca2ba5bbe08a72852f306c83d84b8eef0
Reviewed-on: https://review.typo3.org/53956


Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Daniel Lorenz <daniel.lorenz@extco.de>
Tested-by: Daniel Lorenz <daniel.lorenz@extco.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: TYPO3com <no-reply@typo3.com>