[FIX] http_routing: restrict lang matching to installed lang

When accessing an URL, there is some computation to check if you try to access
a lang. Part of this job is to get the closest language available.
For instance, you could try to get `/fr_BE/..` and it would redirect to
`/fr_FR/..` if french is installed but not belgian french.

There is a known issue when loading files/assets from a module starting by the
same letter than a lang, in debug assets.
Only reported case was `hr_XXX` modules which would be redirected to `hr_HR`
lang (croatian).

So, the issue would only occur when:
1. Debug assets is enabled
2. hr_HR lang is activated
3. only hr_XX modules would be impacted

But since 269aa59411, the issue would appear even if `hr_HR` was not activated.

This commit restore the issue to its minimal case, when `hr_HR` lang is
activated.

closes odoo/odoo#37494

Signed-off-by: Olivier Dony (odo) <odo@openerp.com>

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