package/htpdate: use /run for PIDFile

- rename pidfile from htpdate to htpdate.pid

Fixes:

PIDFile= references a path below legacy directory /var/run/, updating
/var/run/htpdate.pid → /run/htpdate.pid; please update the unit file
accordingly.

Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/htpdate/htpdate.service

@@ -4,10 +4,10 @@ After=network.target
 
 [Service]
 Type=forking
-PIDFile=/var/run/htpdate
+PIDFile=/run/htpdate.pid
 Environment=HTPDATE_ARGS="-a -s -t https://www.google.com"
 EnvironmentFile=-/etc/default/htpdate
-ExecStart=/usr/bin/htpdate -D -i /var/run/htpdate $HTPDATE_ARGS
+ExecStart=/usr/bin/htpdate -D -i /run/htpdate.pid $HTPDATE_ARGS
 
 [Install]
 WantedBy=multi-user.target