plugins/gamecontroller: disable by default

Xaver Huglrequested to merge
work/zamundaaa/disable-gamepad-plugin into master

There's a race condition for controller hotplug that must be fixed before it can be enabled by default.

This was already off by default in 6.6, but apparently we didn't merge that for master. I'll try to fix the issue soon, so we can revert this (only on master)

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