Fix not redirecting to primary alias when tab-specific alias exists

[skamphuis]

Summary

Redirects to default portal alias failed when custom tab alias was used.

Details

In AdvancedUrlRewriter, there already was a check to see if the current alias was a custom tab alias for any tab, but there was no check to see if the alias actually is a custom alias for the request tab. That's what has been added.
In the process, it turned out that stored procedure GetTabCustomAliases was not covering all use cases, so that needed a change too.

I have a site with 3 aliases:

• bli.40fdev.me
• bla.40fdev.me
• ble.40fdev.me

bli is the default and the site is set to redirect. This works in 9.6.1

Then I created a page /zzz and gave it a custom url of /z on alias ble.40fdev.me
Now, the site is not redirecting from ble.40fdev.me to bli.40feev.me anymore, because there is a custom tab alias.

With the fix applied, ble.40fdev.me is redirected to bli, except for ble.40fdev.me/zzz

Fixes #2841

[mitchelsellers]

Tested this appears to fix the issue