[BUGFIX] Show correct timestamp in file replace dialog

The property lastModifiedDate was remove by some browsers, thus with
this change if will be checked and the proper property is used to
parse the timestamp in the replace dialog.

Resolves: #88081
Releases: master, 9.5, 8.7
Change-Id: I4ae812267ef81c4db5c86d2d6dd814f83bebeb00
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60373


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Felix Herrmann <herrmann@riconet.de>
Tested-by: Wolf-Peter Utz <wpu@hotmail.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Felix Herrmann <herrmann@riconet.de>
Reviewed-by: Wolf-Peter Utz <wpu@hotmail.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>