[BRANDING] systemd service trim WatchdogSec=30s

Refs: https://codeberg.org/forgejo/forgejo/issues/777
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contrib/systemd/forgejo.service

@@ -62,7 +62,6 @@ WorkingDirectory=/var/lib/forgejo/
 ExecStart=/usr/local/bin/forgejo web --config /etc/forgejo/app.ini
 Restart=always
 Environment=USER=git HOME=/home/git GITEA_WORK_DIR=/var/lib/forgejo
-WatchdogSec=30s
 # If you install Git to directory prefix other than default PATH (which happens
 # for example if you install other versions of Git side-to-side with
 # distribution version), uncomment below line and add that prefix to PATH