TiledMapResource#getTilesetForTile works incorrectly

[HxShard]

Now it takes first tile set with firstGid < tileGid, even if this tile is out of range.
I have 19 tile sets in my project, and TiledMapResource#getSpriteForGid (which is based on TiledMapResource#getTilesetForTile) works 50/50: reloading page give different results. But before, with only 5 tile sets, everything worked just like a charm. I found that problem was caused by this method. Thank you!

[eonarheim]

@HxShard Thanks for the PR, this 100% makes sense to add.

We must have avoided this issue in the past with embedded tilesets in order of first gid, or low numbers (like only 1) of external tilesets 🤯

[HxShard]

@eonarheim Sorry, I made a mistake here :((

firstGid starts from 1, while ID of first tile is always 0
In tile set with 100 tiles, ID of last tile is 99

So I think, we need to make first condition look like this:
gid >= ts.firstGid && gid <= ts.firstGid + ts.tileCount - 1

Just tested it many times, exactly with -1 function works correctly.

[eonarheim]

Thanks for pointing it out 👍 please raise a new PR when you get a chance