Correct the invocation of addEqualityMatcher in array transforms test

Author: MarkDuckworth

packages/firestore/test/integration/api/array_transforms.test.ts

@@ -34,15 +34,15 @@ import {
 } from '../util/firebase_export';
 import { apiDescribe, withTestDb, withTestDoc } from '../util/helpers';
 
-addEqualityMatcher();
-
 /**
  * Note: Transforms are tested pretty thoroughly in server_timestamp.test.ts
  * (via set, update, transactions, nested in documents, multiple transforms
  * together, etc.) and so these tests mostly focus on the array transform
  * semantics.
  */
 apiDescribe('Array Transforms:', persistence => {
+  addEqualityMatcher();
+
   // A document reference to read and write to.
   let docRef: DocumentReference;