Decrease the default soft shadow quality to improve performance

Soft shadows are relatively expensive to filter. However, with the
default blur factors, it's not needed to use too many samples
(unless PCSS-like shadows are used with a large size). Textures
and screen-space antialiasing can also be used to mask the noise
pattern effectively.

On a GeForce GTX 1080, going from Medium to Low for both shadow types
saves 0.2-0.4 ms of GPU time per frame in 2560×1440 resolution.
This can translate to significantly higher savings on lower-end GPUs.

Given how the shader works, this improves rendering performance
even if lights with shadows are never used.

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