z-index too large

[xprt64]

The z-index is too large: PHP_INT_MAX
It it is set to 99999 it works as expected.

Reference: src/PhpWord/Writer/Word2007/Style/Frame.php at line 44

Please review my fork: https://github.com/xprt64/PHPWord/tree/xprt64
I also created a pull request

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[troosan]

fixed in PR #1178