correct site.isServer deprecation

[ParkedHampster]

other instances of .Site.IsServer were caught and updated as required the vendor/.../helper/debug.html file still had a site.IsServer instance that throws errors on newer versions of hugo

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[Kariton]

Hey, you have fixed the module "in code" - the actual change is needed here:

https://github.com/bowman2001/hugo-mod-image/blob/main/layouts/partials/mod-img/helper/debug.html#L1

[ParkedHampster]

Thank you! Putting this where it actually belongs