Another pile of style cleanups

Florian Müllner requested to merge fmuellner/gnome-shell:style-cleanups into master

gjs updated its eslint rules last cycle to a more thorough set.

Before we are ready to sync up the configuration, here's another big batch of style fixes that prepares our code base for the new rules.

(This is the last big style cleanup, promise! Well, at least I hope it is ...)

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