basic_signal test: temporarily skip trap_signal_test on i386

This case crashes a bhyve VM.

PR: 265889
Sponsored by: The FreeBSD Foundation

(cherry picked from commit c04721e35ff0e8220c88d5b10f068dba18629f7e)
(cherry picked from commit beeeb40bca06c8ebc8953274bbc5759fb432fab2)