foliate: add missing libadwaita dependency

[lipidity]

When libadwaita is not installed, foliate crashes on launch with the following error:

JS ERROR: Error: Requiring Adw, version 1: Typelib file for namespace 'Adw', version '1' not found require@resource:///org/gnome/gjs/modules/esm/gi.js:16:28 @gi://Adw?version=1:3:25

Testing the changes

• I tested the changes in this PR: briefly (foliate stopped crashing after I installed libadwaita)

[sgn]

Bump revision to 2, please.

[oreo639]

It needs to be one commit, you can do:

git reset --soft HEAD~
git commit --amend