Improve audio-only download (#74)

* Improved quality from auto-only download; enables thumbnail and data embedding for audio

* Updated UI to reflect new audio behaviour

lib/pinchflat_web/controllers/media_profiles/media_profile_html/media_profile_form.html.heex

@@ -109,7 +109,7 @@
     options={friendly_resolution_options()}
     type="select"
     label="Preferred Resolution"
-    help="Will grab the closest available resolution if your preferred is not available. Setting to 'Audio Only' negates embedding options."
+    help="Will grab the closest available resolution if your preferred is not available"
   />
 
   <.button class="my-10 sm:mb-7.5 w-full sm:w-auto">Save Media profile</.button>