Change BOM heading from Item to Description

Co-authored-by: kvid <kvid@users.noreply.github.com>

src/wireviz/wv_bom.py

@@ -141,7 +141,6 @@ def bom_list(bom: List[BOMEntry]) -> List[List[str]]:
     # Custom mapping from internal name to BOM column headers.
     # Headers not specified here are generated by capitilising the internal name.
     bom_headings = {
-        "description": "Item",  # TODO: Remove this line to use 'Description' in BOM heading.
         "pn": "P/N",
         "mpn": "MPN"
     }