content_explore: Stop spinners when idle

data/resources/ui/content-explore.ui

@@ -53,8 +53,7 @@
               <class name="explore"/>
             </style>
             <child>
-              <object class="GtkSpinner" id="spinner">
-                <property name="spinning">True</property>
+              <object class="Spinner" id="spinner">
                 <property name="valign">center</property>
                 <property name="halign">center</property>
                 <property name="vexpand">True</property>

src/session/content/explore/mod.rs

@@ -13,7 +13,7 @@ pub use self::{
     public_room::PublicRoom, public_room_list::PublicRoomList, public_room_row::PublicRoomRow,
     servers_popover::ExploreServersPopover,
 };
-use crate::session::Session;
+use crate::{components::Spinner, session::Session};
 
 mod imp {
     use std::cell::{Cell, RefCell};
@@ -31,7 +31,7 @@ mod imp {
         #[template_child]
         pub stack: TemplateChild<gtk::Stack>,
         #[template_child]
-        pub spinner: TemplateChild<gtk::Spinner>,
+        pub spinner: TemplateChild<Spinner>,
         #[template_child]
         pub empty_label: TemplateChild<gtk::Label>,
         #[template_child]