LdapUrl: remove ctor code which made the QUrl invalid.
Summary:
dn() already takes care of removing the leading slash from the path
anyway.
This only showed up during debugging of a new unittest, because actual
kioslave code (which is where LdapUrl is built from QUrl) only queries
for components out of the LdapUrl, not for the full string
representation.
Test Plan: unittest in next commit
Reviewers: dvratil, mlaurent
Reviewed By: mlaurent
Subscribers: KDE PIM
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D12386