snort3: fix issue caused by ucode semantics change

A recent change in the ucode interpeter caused a failure when using
the 'in' operator.
https://github.com/jow-/ucode/commit/be767ae197babd656d4f5d9c2d5013e39ddbe656

Reported in a forum post by @graysky2.
https://forum.openwrt.org/t/194218/28



Signed-off-by: Eric Fahlgren <ericfahlgren@gmail.com>