Got rid of privateKey propagation from getCurrentlyAuthenticatedIdentity.

javascript/src/iframe/viamapi-iframe.js

@@ -960,12 +960,18 @@ const connection = Penpal.connectToParent({
       });
     },
     getCurrentlyAuthenticatedIdentity() {
-      return new Penpal.Promise(result => {
-        result({"data" : window.currentlyAuthenticatedIdentity,
-          "code" : "200",
-          "status" : "Currently authenticated identity"
-        })
-      });
+      const { publicKey, x509Certificate } = window.currentlyAuthenticatedIdentity.authentication;
+
+      return encodeResponse(
+        "200",
+        {
+          authentication: {
+            publicKey,
+            x509Certificate
+          }
+        },
+        "Currently authenticated identity"
+      );
     },
     stringToUtf8ByteArray(str) {
       if (typeof str !== 'string') {