[BUGFIX] Use correct default value for field data_page_reg1

The field data_page_reg1 of table index_phash is defined as integer.
Therefore the default value must be 0 instead of an empty string.

Resolves: #83641
Releases: master, 8.7, 7.6
Change-Id: I4c1f115b8c8bbcb961627d7f5a5a413a8d5cf419
Reviewed-on: https://review.typo3.org/55449


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>