Nonzero delta count capitalization

[Jun1on]

Related Issue

The slot holding the number of nonzero deltas is derived from keccak256("NonzeroDeltaCount"). Most correctly refer to NonzeroDeltaCount, but there are some NonZeroDeltaCount. This was confusing for me and wasted 2 minutes of my life trying to find the source of the red squiggly line.

Description of changes

Rename all NonZeroDeltaCount -> NonzeroDeltaCount