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

Summary:
This was supposed to be part of commit 5454283008f2, 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