Fix test_peers_following_each_other for Windows (#28008)

Release Notes:

- N/A

crates/collab/src/tests/following_tests.rs

@@ -674,7 +674,7 @@ async fn test_peers_following_each_other(cx_a: &mut TestAppContext, cx_b: &mut T
     client_a
         .fs()
         .insert_tree(
-            "/a",
+            path!("/a"),
             json!({
                 "1.txt": "one",
                 "2.txt": "two",
@@ -683,7 +683,7 @@ async fn test_peers_following_each_other(cx_a: &mut TestAppContext, cx_b: &mut T
             }),
         )
         .await;
-    let (project_a, worktree_id) = client_a.build_local_project("/a", cx_a).await;
+    let (project_a, worktree_id) = client_a.build_local_project(path!("/a"), cx_a).await;
     active_call_a
         .update(cx_a, |call, cx| call.set_location(Some(&project_a), cx))
         .await