[purview] fix linter error (Azure#21546)

to unblock js - eslint-plugin - ci build, while we are still investigating why
the error is not reported by PR validation.

Author: jeremymeng

sdk/purview/purview-catalog-rest/test/public/glossary.spec.ts

@@ -37,7 +37,7 @@ describe("purview catalog glossary test", () => {
     console.log("created glossary: ", glossary);
 
     assert.strictEqual(glossary.status, "200");
-    glossaryGuid = glossary.status == "200" ? glossary?.body?.guid || "" : "";
+    glossaryGuid = glossary.status === "200" ? glossary?.body?.guid || "" : "";
   });
 
   it("should work with LRO helper", async () => {