[systemd] Update the mailhog script

systemd/.config/systemd/user/mailhog.service

@@ -3,7 +3,7 @@ Description=Mailhog
 After=network.target
 
 [Service]
-ExecStart=/usr/bin/env /usr/local/bin/mailhog > /dev/null 2>&1 &
+ExecStart=/usr/bin/env mailhog > /dev/null 2>&1 &
 Restart=on-failure
 SuccessExitStatus=3 4
 RestartForceExitStatus=3 4