Potentially problematic event listener setup

[jeffijoe]

Was randomly browsing the code and noticed this:

fizzy/app/javascript/controllers/lightbox_controller.js

Lines 6 to 12 in 372d46f

	connect() {
	this.dialogTarget.addEventListener('transitionend', this.handleTransitionEnd.bind(this))
	}
	disconnect() {
	this.dialogTarget.removeEventListener('transitionend', this.handleTransitionEnd.bind(this))
	}

.bind(this) returns a new function, so the original listener won't be removed when disconnect is called.

[jeremy]

Sharp eye! Fixed here: #1973