Format the duplicate-declaration e2e assert

Wraps one long assert in the new Bundler capstone so rustfmt leaves
the file unchanged. No behavior change.

Assisted-by: Claude Code:claude-opus-5-5

Author: claude

crates/socket-patch-cli/tests/e2e_redirect_gem_build.rs

@@ -1651,7 +1651,10 @@ async fn gem_hosted_gem_declared_in_two_groups_is_refused_and_still_installs() {
         Driver::ScanVexDuplicateDeclaration,
     )
     .await;
-    assert!(fx.is_none(), "the duplicate-declaration driver asserts in place");
+    assert!(
+        fx.is_none(),
+        "the duplicate-declaration driver asserts in place"
+    );
 }
 
 /// #482: a direct dependency declared through `eval_gemfile` must not get a