Wait forever until the lock file can be locked

Summary:

• timeout = 3000 is a bit short on some computer. Use timeout = -1 will work for any case.

BUG: 401041

FIXED-IN: v0.8.5

Test Plan: BUG: 401041 is fixed on my computer.

Reviewers: mvourlakos, Latte Dock

Reviewed By: mvourlakos

Tags: Latte Dock, Plasma

Differential Revision: https://phabricator.kde.org/D18258