[PATCH] lua: remove luajit pushlstring workaround

[PATCH] lua: remove luajit pushlstring workaround

81ee6f5aadeb ("lua: push correct length back through ScFlowvarGet, work around valgrind warning")
added a workaround for valgrind warnings in pushing a string buffer
into the lua state. This is no longer needed as tested with both
address sanitizer and valgrind.

(cherry picked from commit 52fd61dffdfa50c9a2d4ec24865a54da0b8f0a2a)

Origin: upstream, https://github.com/OISF/suricata/commit/a7ff4c9ba53009680c7cd128b16c28d0aeda9886.patch
Bug: https://redmine.openinfosecfoundation.org/issues/8065
Subject: Upstream fix for CVE-2025-64344

Gbp-Pq: Name CVE-2025-64344.patch