The previous patch didn't take into account that the accessors passed
in as the format array were dot-prefixed due to the previous eval-based
construction.
The only two uses of RTree that I found were in World.js:
```javascript
this.tree = new RTree(this.maxEntries, [ '.left', '.top', '.right', '.bottom' ]);
this.staticTree = new RTree(this.maxEntries, [ '.left', '.top', '.right', '.bottom' ]);
```
It's likely that this could be updated to just not pass dotted attribute
names but I wasn't super comfortable that they weren't needed in this form
elsewhere despite a quick search. I'd honestly say that it might be a better
change if we remove the dots before merge but I'll leave that up to the
discretion of the reviewers/merger.
I'm not super familiar with Phaser's style but I passed lint sooo :D
Buyer beware: the only testing I did was on the repo case I left in the
bug and I did not verify that this is still within the twitch CSP (though
it should be).
