Support Cold Snap more chill effect quality

[0xjc]

Fixes Cold Snap quality "% more effect of chill" not being parsed. Furthermore, fixes "more" modifiers on chill effect not being applied to enemy chill effect/bonechill. The latter also fixes #6777 and #5037.

Link to a build that showcases this PR:

https://pobb.in/u/Arcinde/hhdZhirZpJ8H

Before screenshot:

Cold Snap mod not being parsed: Even after parsing Cold Snap mod, it is not calculated in effect of chill, despite the "chill effect mod" line below showing the correct value Not calculated in bonechill damage increase

After screenshot:

Cold Snap mod is parsed: Effect of chill correctly incorporates "more": This value is taken up correctly for the bonechill damage increase of the main skill: