fix: Change how events.keydown checks classList for mapboxgl-canvas

[thaddmt]

Overview

• Originally events.keydown only checked the first value in the classList to see that it matches mapboxgl-canvas
• Updated so that it checks the full classList for the value mapboxgl-canvas
  • This enables usage with a classList that starts with maplibregl-canvas for instance
• NOTE - Contains vs Includes
  • DOMTokenList only supports contains
  • In our tests we create synthetic events with an array for a classList which only supports includes
  • Couldn't create a DOMTokenList without creating an element so went with this approach