Remove a couple of misleading comments

It's best not to add unnecessary code comments like this: they're not
actually accurate (there are multiple required params after the `#
Optional` comment), and the code is clear enough without the comments
anyway.

via/app.py

@@ -12,15 +12,13 @@
 from via.sentry_filters import SENTRY_FILTERS
 
 PARAMETERS = {
-    # Required
     "client_embed_url": {"required": True},
     "nginx_server": {"required": True},
     "via_html_url": {"required": True},
     "checkmate_url": {"required": True},
     "via_secret": {"required": True},
     "checkmate_api_key": {"required": True},
     "nginx_secure_link_secret": {"required": True},
-    # Optional
     "checkmate_ignore_reasons": {},
     "checkmate_allow_all": {"formatter": asbool},
     "dev": {"formatter": asbool},