Fix cache removal options

[MSuih]

Adjusts RemoveShadersCache, RemovePPUCache and RemoveSPUCache to use the new cache location and thus makes these functions work again when rightclicking items in game list.

Fixes #5557

[Nekotekina]

Are they tested to actualy delete new cache? May need some adjustments.

[JohnHolmesII]

There's also the right click -> make ppu cache failing silently

[Kravickas]

u could add option Open Cache Folder, under the Open Install Folder and Open Config Folder

[Megamouse]

@Nekotekina I just tried and all the related files in the cache dir were deleted as expected.
(Subdirectories are scanned as well)

[MSuih]

@Nekotekina Yes. I did test this before creating a pull request. The removal functions are very dumb, they just recursevily iterate the directory and remove files ending with ".obj" or ".dat", or a folder named "shaders_cache". They don't care about cache versions or anything like that, all they need is to get pointed at the right directory.

@Kravickas I'll try to keep the scope of this pull request as small as possible so that it can be quickly merged. Megamouse has open PR for some misc improvements, you could do feature requests there.

@JohnHolmesII I looked at it and I've no idea why it doesnt work. I'll let Megamouse fiddle with it, it's not very useful feature even when it works.