Revert "Hide the mouse when the user is typing in the editor (#25040)" (#25393)

This reverts commit a8610fbd13.

I've been seeing some reports of segmentation faults that appear to
point to this change as the culprit.

Closes #25366.

Release Notes:

- Community: Reverted #25040, so remove the corresponding entry from the
release notes.

crates/gpui/src/platform/mac/platform.rs

@@ -938,7 +938,6 @@ impl Platform for MacPlatform {
                 CursorStyle::DragLink => msg_send![class!(NSCursor), dragLinkCursor],
                 CursorStyle::DragCopy => msg_send![class!(NSCursor), dragCopyCursor],
                 CursorStyle::ContextualMenu => msg_send![class!(NSCursor), contextualMenuCursor],
-                CursorStyle::None => msg_send![class!(NSCursor), setHiddenUntilMouseMoves:YES],
             };
 
             let old_cursor: id = msg_send![class!(NSCursor), currentCursor];