Show home URL instead of site URL on site info

[flixos90]

In the "Info" tab of the "Site Info" screen the site URL is currently being shown for the main site of the network. This feels wrong to me, I think it should rather show the home URL since this is the URL that you can access the site's frontend at. When you use a custom directory structure, seeing a URL like http://example.com/wp is misleading to me.

[ericlewis]

I agree. We should probably have parity with how home url is described in Settings > General page on single site, which is Site Address (URL).

[jeremyfelt]

Agreed, changing this makes sense. The primary purpose of this field is to update the domain and path fields associated with the site in wp_blogs. We only update the home and siteurl options when the previously set domain and path match exactly.

We should change this to be prefilled with the current domain/path combination and use Eric's suggested Site Address (URL) for parity with single site.

[rachelbaker]

In 35632.2.diff​ I changed the field label to Site Address (URL)

[flixos90]

35632.3.diff​ changes the usage of siteurl to home to be consistent with the usage on non-multisite installs and to actually show the correct site address in case someone uses a custom directory structure with WordPress in a subdirectory.

[jeremyfelt]

35632.4.diff​ uses the combination of domain and path from wp_blogs to display the site address for the main site, which aligns with the non-main site display.

[jeremyfelt]

In 36682:

Multisite: Show the main site's domain and path in site-info.php

• Use the domain and path combination from wp_blogs when displaying the site address for the main site.\
• Update the text from "Site URL" to "Site Address (URL)" for all sites in site-info.php to better align with how we refer to this in single site.

Props flixos90, rachelbaker.
Fixes #35632.