Remove global service declarations and change to declarations upon usage. (#761)

* Remove global service declarations and change to declarations upon usage.

* Only load cava service if cava is enabled.

src/lib/behaviors/autoHide.ts

@@ -1,10 +1,10 @@
 import { bind, Variable } from 'astal';
-import { hyprlandService } from '../constants/services';
 import { App } from 'astal/gtk3';
 import AstalHyprland from 'gi://AstalHyprland?version=0.1';
 import { forceUpdater } from 'src/components/bar/modules/workspaces/helpers';
 import options from 'src/options';
 
+const hyprlandService = AstalHyprland.get_default();
 const { autoHide } = options.bar;
 
 const focusedClient = (focusedClient: AstalHyprland.Client): void => {