Update demo app to use an await* function that doesn't require a function literal receiver

[arriolac]

Is your feature request related to a problem? Please describe.
To help with learning how to use the library, the demo app should also add usage of another await* extension function which does not require a function literal with receiver. Currently, the demo app only shows how to use one of the await functions (see: https://github.com/googlemaps/android-places-ktx/blob/36b727998b09c6adc76117ad321ac04d35b5c6d9/app/src/main/java/com/google/places/android/ktx/demo/PlacesSearchViewModel.kt).

Describe the solution you'd like
Use awaitFetchPhoto both without an actions param, and with it.

Describe alternatives you've considered
Do nothing.

Additional context
See #103 (comment)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Please comment here if it is still valid so that we can reprioritize. Thank you!