Don't enable two-clicks renaming in single-click mode

Summary:
This was supposed to be part of commit 54542830, but apparently we
didn't notice it was missing.

Test Plan:
- Enable single-click mode from system settings
- Select a file in dolphin
- Long-click the selected file and make sure inline renaming doesn't start

Subscribers: kfm-devel

Tags: #dolphin

Differential Revision: https://phabricator.kde.org/D16460