Style focus delay field as a regular text input

The “Focus follows cursor delay ” field looks like a label by
default. Apply the default text input style so it clearly appears and
behaves like an input field.

Author: istekhar8966

cosmic-settings/src/pages/desktop/window_management.rs

@@ -331,6 +331,7 @@ pub fn focus_navigation() -> Section<crate::pages::Message> {
                     .select_on_focus(true)
                     .on_input(Message::SetFocusFollowsCursorDelay)
                     .on_submit(|_| Message::SaveFocusFollowsCursorDelay(true))
+                    .style(cosmic::theme::TextInput::Default)
                     .width(Length::Fixed(80.0)),
                 ))
                 .add(settings::item(