Fix unresponsive Help menu in macOS

* src/nsterm.m (ns_check_menu_open): Don't postpone mouse drag and
non-user-generated mouse down events (Bug#31371).
1 job for master in 65 minutes and 49 seconds (queued for 3 seconds)
Status Job ID Name Coverage
failed #4157


Name Stage Failure
test-all Test
Makefile:319: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:294: recipe for target 'check-expensive' failed
make[1]: Leaving directory '/builds/emacs/emacs/test'
make[1]: *** [check-expensive] Error 2
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1