Add Element Call room settings (#9347)

Co-authored-by: Robin <robin@robin.town>

src/SdkConfig.ts

@@ -33,6 +33,7 @@ export const DEFAULTS: IConfigOptions = {
     element_call: {
         url: "https://call.element.io",
         use_exclusively: false,
+        brand: "Element Call",
     },
 
     // @ts-ignore - we deliberately use the camelCase version here so we trigger