applets/taskmanager: fix task list RTL alignment

Nate Grahamrequested to merge
ngraham/plasma-desktop:fix-taskmanager-rtl into master

LayoutMirroring needed to be enabled when needed here.

cc @mart @ratijas

BUG: 491211 FIXED-IN: 6.1.5

Testing with LANGUAGE=ar_AR plasmashell --replace:

Before After
Before After
Edited by Nate Graham

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