Enable zfs-mount-generator by default

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Antonio Russo <antonio.e.russo@gmail.com>
Closes openzfs#8750
Closes openzfs#8848

cmd/zed/zed.d/Makefile.am

@@ -38,6 +38,7 @@ $(nodist_zedexec_SCRIPTS): %: %.in
 zedconfdefaults = \
 	all-syslog.sh \
 	data-notify.sh \
+	history_event-zfs-list-cacher.sh \
 	resilver_finish-notify.sh \
 	scrub_finish-notify.sh \
 	statechange-led.sh \