Fix cursor styles not displaying properly (#3493)

This PR fixes an issue where an element with a cursor style set would
not update the cursor when hovering over it.

Previously the cursor style would only appear by interacting with the
element in some way, for instance, by clicking on the element or by
having a `.hover` with some other style being applied.

Release Notes:

- N/A

crates/gpui2/src/elements/div.rs

@@ -866,6 +866,7 @@ impl Interactivity {
         }
 
         if self.hover_style.is_some()
+            || self.base_style.mouse_cursor.is_some()
             || cx.active_drag.is_some() && !self.drag_over_styles.is_empty()
         {
             let bounds = bounds.intersect(&cx.content_mask().bounds);

crates/storybook2/src/stories/cursor.rs

@@ -102,7 +102,6 @@ impl Render for CursorStory {
                         .w_64()
                         .h_8()
                         .bg(gpui::red())
-                        .hover(|style| style.bg(gpui::blue()))
                         .active(|style| style.bg(gpui::green()))
                         .text_sm()
                         .child(Story::label(name)),