Fix formatting in workspace Cargo.toml (#38563)

This PR fixes some formatting issues in the workspace `Cargo.toml`.

Release Notes:

- N/A

Cargo.toml

@@ -219,8 +219,9 @@ members = [
     # Tooling
     #
 
+    "tooling/perf",
     "tooling/workspace-hack",
-    "tooling/xtask", "tooling/perf",
+    "tooling/xtask",
 ]
 default-members = ["crates/zed"]