contrib/systemd/labgrid-exporter: move StartLimitIntervalSec from Service to Unit section

StartLimitIntervalSec belongs in the "Unit" section, not in the "Service"
section.

Fixes: b3569dd ("contrib/systemd/labgrid-exporter: make service restart always and indefinitely")
Signed-off-by: Bastian Krause <bst@pengutronix.de>

Author: Bastian-Krause

contrib/systemd/labgrid-exporter.service

@@ -2,6 +2,7 @@
 Description=Labgrid Exporter
 After=network-online.target
 Wants=network-online.target
+StartLimitIntervalSec=0
 
 [Service]
 Environment="PYTHONUNBUFFERED=1"
@@ -10,7 +11,6 @@ EnvironmentFile=-/etc/environment
 ExecStart=/path/to/labgrid/venv/bin/labgrid-exporter /etc/labgrid/exporter.yaml
 Restart=always
 RestartSec=30
-StartLimitIntervalSec=0
 DynamicUser=yes
 # Adjust to your distribution (most often "dialout" or "tty")
 SupplementaryGroups=dialout plugdev