[effects/translucency] Make inactive Wayland clients translucent

Summary:
There is no concept of managed windows in Wayland, so every time we call
managed() on a Wayland client, it will return false.

This change addresses that problem by invoking managed() only for X11 clients.

CCBUG: 398100

Test Plan:

• Open KCM of the Translucency effect and decrease opacity of inactive windows;
• Open Dolphin;
• Click on desktop.

Reviewers: KWin, davidedmundson

Reviewed By: KWin, davidedmundson

Subscribers: kwin

Tags: KWin

Differential Revision: https://phabricator.kde.org/D16319