Add Haskell file type icon (#6995)

Small change to add the Haskell logo as a file icon. Screenshot below
shows what this looks like.

![CleanShot 2024-01-29 at 11 21
30@2x](https://github.com/zed-industries/zed/assets/132238190/b484c679-965a-4e73-88dc-ebb670a0f390)

Pseudomata committed 2y ago

d694017d0568f2a5815f5330be5d2574bdc64a65

Parent: d1a6003

Committed by GitHub <noreply@github.com> on 1/29/2024, 4:32:35 PM