Fix setConsent to properly use the update gtag command

.changeset/cold-brooms-run.md

@@ -0,0 +1,5 @@
+---
+'@firebase/analytics': patch
+---
+
+Analytics - fixed an issue where setConsent was clobbering the consentSettings before passing them to the gtag implementation.

packages/analytics/src/helpers.ts

@@ -304,8 +304,12 @@ function wrapGtag(
           gtagParams as GtagConfigOrEventParams
         );
       } else if (command === GtagCommand.CONSENT) {
-        const [gtagParams] = args;
-        gtagCore(GtagCommand.CONSENT, 'update', gtagParams as ConsentSettings);
+        const [consentString, gtagParams] = args;
+        gtagCore(
+          GtagCommand.CONSENT,
+          consentString,
+          gtagParams as ConsentSettings
+        );
       } else if (command === GtagCommand.GET) {
         const [measurementId, fieldName, callback] = args;
         gtagCore(