Fix LimitNOFILE in Debian systemd unit

packaging/deb/systemd/grafana-server.service

@@ -14,7 +14,7 @@ ExecStart=/usr/sbin/grafana-server                                \
                             --config=${CONF_FILE}                 \
                             --pidfile=${PID_FILE}                 \
                             cfg:default.paths.logs=${LOG_DIR}     \
-                            cfg:default.paths.data=${DATA_DIR}    \
+                            cfg:default.paths.data=${DATA_DIR}
 LimitNOFILE=10000
 TimeoutStopSec=20
 UMask=0027