EZP-21325: View parameters parsing transforms multiple slashes into one slash

JIRA: https://jira.ez.no/browse/EZP-21325

# Description

The title says it all. A common use case for this is the need to pass an absolute URL with its scheme in a view parameter. Without the patch `/(url)/http://ez.no` is parsed as `/(url)/http:/ez.no`

# Tests

manual + unit tests