Use 0 as the min blur radius for the new blur features

Previously, this was set to 1px following what BlurUtils was doing, however ShadeDepthController explicitly sets shade blur radius to 0.
Bouncer and GH rely on BlurConfig for the min blur radius which should be 0.

Bug: 370555003
Change-Id: Ie75e3c17a10d0ae528041043c9eeafbd0eb40f66
Flag: com.android.systemui.bouncer_ui_revamp
Test: NA