emojichooser: Actually disable the recent section

The loop sets empty = FALSE when there are emojis but for that
to work we need to initialize the value to TRUE initially.

Fixes: 7928532bc5

gtk/gtkemojichooser.c

@@ -312,7 +312,7 @@ populate_recent_section (GtkEmojiChooser *chooser)
   GVariant *variant;
   GVariant *item;
   GVariantIter iter;
-  gboolean empty = FALSE;
+  gboolean empty = TRUE;
 
   variant = g_settings_get_value (chooser->settings, "recent-emoji");
   g_variant_iter_init (&iter, variant);