textproc/php83-xsl: Remove xsltCleanupGlobals call in ext/xsl MSHUTDOWN

The call to xsltCleanupGlobals() during module shutdown can cause a
segfault in xmlHashFree() when freeing libxslt internal hash tables.
This is the same class of shutdown cleanup issue that led to
xmlCleanupParser() being removed from ext/libxml. The process is about
to exit and the OS will reclaim all memory, making the explicit cleanup
both unnecessary and harmful.