Filled map items ignore item_model component in first person

Relates to MC-229142 and MC-276654.

The bug

If a map is given the model of something that isn't a map using components, holding it will still cause it to appear as a map in first person.

All other items (except tridents - see MC-276654) correctly display as the model specified in the component.

How to reproduce

1. /give @s minecraft:filled_map[minecraft:item_model=blue_wool,map_id=1]

2. /give @s minecraft:stick[minecraft:item_model=blue_wool]

Expected results

When held in first person, both of these would appear as blue wool.

Actual results

The stick correctly appears as blue wool but the map does not.