Set default host to solr, not localhost

The default of the module should not target a specific development environment. (even if I use ddev)
I will keep the the default as it is.

By I will accept a patch that changes it dynamically if a ddev environment is detected.

Thanks for your answer, and after looking into this some more, I agree that it is probably best to stick to localhost as the default. So I am closing my Github PR.

I created a new Github issue, to check if it can be handled in DDEV, either by switching to use localhost, or adding an automatic override in settings.ddev.php file. Setting to "Postponed", until this is cleared up.

Updating title, since direction and proposed solution has changed.