Fix CPUParticles emission updating using physics interpolation #60347
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When switching emission on and off, processing was always being switched on and off using internal_process, which was incorrect for using physics interpolation (where physics_process is the relevant one).
This PR correctly updates the process mode according to whether physics interpolation is being used.
Fixes bug mentioned by @mackatap in #52846 .
Notes
internal_process
, but they have to do this withinternal_physics_process
when interpolation is enabled.emission
flag, rather than always setting processing to on at start, which is probably more correct for starting aCPUParticles
in a non-emitting state.