chore: update example service config

Author: marjune163

conf/systemd/etc/systemd/system/ghfs.service

@@ -4,7 +4,7 @@ After=network.target
 
 [Service]
 Type=simple
-ExecStartPre=/sbin/setcap CAP_NET_BIND_SERVICE=+ep /usr/local/bin/ghfs
+AmbientCapabilities=CAP_NET_BIND_SERVICE
 ExecStart=/sbin/runuser -u nobody -- /usr/local/bin/ghfs --config=/etc/ghfs.conf
 # ExecStart=/sbin/runuser -u nobody -- sh -c 'GHFS_CPU_PROFILE_FILE=/var/log/cpu-`date +%%F-%%T`.pprof exec /usr/local/bin/ghfs --config=/etc/ghfs.conf'
 ExecReload=/bin/kill -s HUP $MAINPID

conf/systemd/etc/systemd/system/ghfs@.service

@@ -4,7 +4,7 @@ After=network.target
 
 [Service]
 Type=simple
-ExecStartPre=/sbin/setcap CAP_NET_BIND_SERVICE=+ep /usr/local/bin/ghfs
+AmbientCapabilities=CAP_NET_BIND_SERVICE
 ExecStart=/sbin/runuser -u nobody -- /usr/local/bin/ghfs --config=/etc/ghfs_%I.conf
 # ExecStart=/sbin/runuser -u nobody -- sh -c 'GHFS_CPU_PROFILE_FILE=/var/log/cpu-`date +%%F-%%T`.pprof exec /usr/local/bin/ghfs --config=/etc/ghfs_%I.conf'
 ExecReload=/bin/kill -s HUP $MAINPID