revert schedule change for debug render. fixes #496

[Hellzbellz123]

opened as draft cause im not sure if a whole new pr/issue is the way to go

revert schedule change for PhysicsDebugPlugin because it causes large lag

Objective

fixes issue #496 recent scheduling changes from commit 4d082a79 causes PhysicsDebugPlugin too generate lots of lag when enabled

Solution

change default schedule from FixedPostUpdate too PostUpdate

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