Fix application icons in "task list" in Windows 8 camouflage

With “task list” I mean either window-picker-applet, or the good old “Window List”. It’s enough to fix this for the application we currently have launcher for.

Feature Branch: bugfix/7325-task-list-icons

Parent Task: #6342 (closed)

Original created by @anonym on 7325 (Redmine)

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