[BUGFIX] Write "PropertyGridEditor" default values as integer number

Write default values which are written through
"Inspector-PropertyGridEditor" inspector editors (form editor) as
integer numbers if the values can be interpreted as integer numbers.

Resolves: #88240
Releases: master, 9.5
Change-Id: If46b571782c64fc96905ab539f63de318c1515d4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60616


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>