Revert "settings: Remove auxiliary Content types where possible (#16744)" (#17768)

This breaks setting `{"scrollbar": {"show":"never"}}`
Release Notes:

- N/A

crates/collab_ui/src/chat_panel/message_editor.rs

@@ -113,7 +113,9 @@ impl MessageEditor {
             editor.set_show_indent_guides(false, cx);
             editor.set_completion_provider(Box::new(MessageEditorCompletionProvider(this)));
             editor.set_auto_replace_emoji_shortcode(
-                MessageEditorSettings::get_global(cx).auto_replace_emoji_shortcode,
+                MessageEditorSettings::get_global(cx)
+                    .auto_replace_emoji_shortcode
+                    .unwrap_or_default(),
             );
         });
 
@@ -128,7 +130,9 @@ impl MessageEditor {
         cx.observe_global::<settings::SettingsStore>(|view, cx| {
             view.editor.update(cx, |editor, cx| {
                 editor.set_auto_replace_emoji_shortcode(
-                    MessageEditorSettings::get_global(cx).auto_replace_emoji_shortcode,
+                    MessageEditorSettings::get_global(cx)
+                        .auto_replace_emoji_shortcode
+                        .unwrap_or_default(),
                 )
             })
         })