Use absolute URI for redirect URL in PayrexxTopUpView

[Xpirix]

Fix for #41

The pre-commit hook made a lot of changes to the file but the actual changes are:

QGIS-Certification-Website/django_project/certification/views/payrexx.py

Lines 89 to 93 in 6cf1951

	redirect_url = request.build_absolute_uri(
	reverse(
	"certifyingorganisation-detail", kwargs={"slug": self.organisation_slug}
	)
	)