fix: remove stale @ts-ignore for localIdeographFontFamily across all map modules

[subodhbhyri]

Problem

Three files contained a // @ts-ignore Mapbox specific prop comment above the
localIdeographFontFamily assignment in _updateStyle:

• modules/react-maplibre/src/maplibre/maplibre.ts
• modules/react-mapbox/src/mapbox/mapbox.ts
• modules/main/src/mapbox-legacy/mapbox/mapbox.ts

The comment was misleading and the @ts-ignore was unnecessary:

• react-maplibre: localIdeographFontFamily is fully present in
  maplibre-gl v5's MapOptions and StyleOptions types
• react-mapbox: localIdeographFontFamily is present in mapbox-gl v3's
  MapOptions type (line 15141)
• mapbox-legacy: mapbox-gl v1 ships no .d.ts files at all, so the prop
  is valid at runtime regardless

In all three cases, TypeScript 4.9+ in-operator narrowing makes the
@ts-ignore unnecessary. Inside if ('localIdeographFontFamily' in nextProps),
TypeScript widens nextProps to ...Props & Record<'localIdeographFontFamily', unknown>,
making the property access legal. Since options is typed any, assigning
unknown → any is permitted without suppression.

Fixes #2537

Changes

• Removed @ts-ignore from all three files
• Updated comments to accurately describe the prop and why no suppression is needed

Notes

localIdeographFontFamily already reaches the MapLibre/Mapbox constructor
correctly via the ...props spread in _initialize() — no runtime behavior
is changed by this PR.