fix(regression): GTK refactor causing updates to be missed

Regression introduced by recent GTK refactor.

The `glib_recv` macros  previously using the passed in expression as the receiver, which was causing a new receiver to be created *every* time an event was received. This caused some peculiar behaviours where some events just never got through if sent too close to each other.

This was most obvious in the `workspaces` module.

Fixes #381

src/modules/clipboard.rs

@@ -145,7 +145,7 @@ impl Module<Button> for ClipboardModule {
     fn into_popup(
         self,
         tx: mpsc::Sender<Self::ReceiveMessage>,
-        mut rx: broadcast::Receiver<Self::SendMessage>,
+        rx: broadcast::Receiver<Self::SendMessage>,
         _info: &ModuleInfo,
     ) -> Option<gtk::Box>
     where