Bug 22132: (QA follow-up) Tests - use Mojo builtin for auth

Bug 22132: (QA follow-up) Tests - use Mojo builtin for auth

Mojolicious has built in handling for encoding/decoding of of basic auth
paramenters. We should use it to simplify our test here.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 8ee08c3922dd892e9432ce243fc7244092fdd18f)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit a9b3b01dd9290f964d739e0f2f818990d9a6e9ba)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>