Remove slightly confusing variable assignation
Remove slightly confusing variable assignation

`var compnentInstances = this.componentInstances` made it less obvious that we were acting on a property of `this` and doesn't really add any optimisation since it's just a property lookup.

keithiopia/spotlight,alphagov/spotlight,tijmenb/spotlight,keithiopia/spotlight,keithiopia/spotlight,alphagov/spotlight,alphagov/spotlight,tijmenb/spotlight,tijmenb/spotlight