r.VT.PoolSizeScale should be changeable at runtime so that we can resize VT physical pools for iteration on selecting pool sizes.

It works correctly at engine startup but runtime changes have no effect.

Steps to Reproduce

Open QAGame project and load TM-RuntimeVirtualTextures map.
Run console command 1
Observe the on screen display of pool sizes.
Run console command r.vt.poolsizescale 0.5
Observe the change in pool sizes.

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Fix Commit29996755
CreatedApr 21, 2023
ResolvedJan 11, 2024
UpdatedFeb 19, 2024
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