[gnome-boxes] assistant: Don't rely on implicit .begin since its deprecated

[Felipe Borges <felipeborges src gnome org>]

commit 8fbe4649fe9fe15d1d740d2e1aa6340a2c520895
Author: Felipe Borges <felipeborges gnome org>
Date:   Tue Mar 1 13:41:46 2022 +0100

    assistant: Don't rely on implicit .begin since its deprecated

 src/assistant/index-page.vala | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/src/assistant/index-page.vala b/src/assistant/index-page.vala
index 881ad0be..a5b68d6d 100644
--- a/src/assistant/index-page.vala
+++ b/src/assistant/index-page.vala
@@ -75,15 +75,15 @@ private async void populate_media_lists () {
         yield media_manager.connect_to_tracker ();
 
         installer_medias = yield media_manager.list_installer_medias ();
-        populate_detected_sources_list (MAX_MEDIA_ENTRIES);
+        yield populate_detected_sources_list (MAX_MEDIA_ENTRIES);
     }
 
-    private void populate_detected_sources_list (int? number_of_items = null) {
+    private async void populate_detected_sources_list (int? number_of_items = null) {
         var number_of_available_medias = installer_medias.length ();
         source_model.remove_all ();
 
         if (number_of_available_medias == 0) {
-            populate_recommended_downloads_list ();
+            yield populate_recommended_downloads_list ();
 
             return;
         }
@@ -129,8 +129,8 @@ private void update_topbar () {
         }
     }
 
-    private void on_expand_detected_sources_list () {
-        populate_detected_sources_list ();
+    private async void on_expand_detected_sources_list () {
+        yield populate_detected_sources_list ();
 
         view_more_medias_button.get_parent ().destroy ();
     }