ui2: Reference theme2 and settings2 crates without the 2 (#3424)

This PR updates the `ui2` crate to reference the `theme2` and
`settings2` crates without the `2` the way we do in our other crates.

Release Notes:

- N/A

crates/ui2/src/components/checkbox.rs

@@ -1,7 +1,6 @@
 use gpui::{div, prelude::*, Div, Element, ElementId, IntoElement, Styled, WindowContext};
 
-use theme2::ActiveTheme;
-
+use crate::prelude::*;
 use crate::{Color, Icon, IconElement, Selection};
 
 pub type CheckHandler = Box<dyn Fn(&Selection, &mut WindowContext) + 'static>;

crates/ui2/src/components/popover.rs

@@ -3,9 +3,9 @@ use gpui::{
     WindowContext,
 };
 use smallvec::SmallVec;
-use theme2::ActiveTheme;
 
-use crate::{v_stack, StyledExt};
+use crate::prelude::*;
+use crate::v_stack;
 
 /// A popover is used to display a menu or show some options.
 ///

crates/ui2/src/components/tooltip.rs

@@ -1,6 +1,6 @@
 use gpui::{overlay, Action, AnyView, IntoElement, Overlay, Render, VisualContext};
-use settings2::Settings;
-use theme2::{ActiveTheme, ThemeSettings};
+use settings::Settings;
+use theme::ThemeSettings;
 
 use crate::prelude::*;
 use crate::{h_stack, v_stack, Color, KeyBinding, Label, LabelSize, StyledExt};