Minor fixes (#4091)

* Fix old urls.

Still had some /admin/ urls floating around, which was causing bad
redirects in some instances.  Should fix #4085

* The modal seems to be confusing license upload. be more explicit in the route we redirect to.

* Fix #4039.  Use proper methods for location assets.

This also fixes a bunch of n+1 issues in the transformer.  Also: curious
to know what Location::assets() does, because it doesn't do what I want
it to :)

app/Http/Transformers/LocationsTransformer.php

@@ -38,8 +38,8 @@ class LocationsTransformer
                 'state' => e($location->state),
                 'country' => e($location->country),
                 'zip' => e($location->zip),
-                'assets_checkedout' => $location->assets()->count(),
-                'assets_default'    => $location->assignedassets()->count(),
+                'assets_checkedout' => $location->location_assets_count,
+                'assets_default'    => $location->assigned_assets_count,
 
                 'created_at' => Helper::getFormattedDateObject($location->created_at, 'datetime'),
                 'updated_at' => Helper::getFormattedDateObject($location->updated_at, 'datetime'),