Add webmessaging.mypurecloud.com to yellowlist

Yet another customer support chat widget

Author: ghostwords

src/data/pbconfig.json

@@ -908,6 +908,7 @@
         "mtvnservices.com",
         "mux.com",
         "myportfolio.com",
+        "webmessaging.mypurecloud.com",
         "api-cdn.mypurecloud.de",
         "apps.mypurecloud.de",
         "webmessaging.mypurecloud.de",