Blender Git Loki

Fix T85845 EEVEE: Depth Of Field: Artifacts with slight out of focus

This was caused by the bokeh LUT being sampled outside the valid range.
But `texelFetch` is only valid if the sample actually exists. This lead to
undefined behavior.

The fix is to increase `DOF_MAX_SLIGHT_FOCUS_RADIUS` (which just offsets the
LUT along the X=Y axis) to avoid any sample outside the defined range.