Enable Element Call integration in rooms by default (#1685)

Also change base url to `call.element.dev`.

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/advanced/AdvancedSettingsPresenter.kt

@@ -82,7 +82,7 @@ class AdvancedSettingsPresenter @Inject constructor(
                     validator = ::customElementCallUrlValidator,
                 )
             } else null,
-            eventSink = ::handleEvents
+            eventSink = { handleEvents(it) }
         )
     }