feat: disable edxapp legacy browser in newrelic.ini.j2 for prod (#51)

Disabling in stage and edge went smoothly, so this
adds disabling NR legacy edxapp browser monitoring
in prod as well.

playbooks/roles/edxapp/templates/newrelic.ini.j2

@@ -26,10 +26,6 @@
 # Transactions). This lets us do things like facet front end load time by
 # `course_id`.
 #
-{% if COMMON_ENVIRONMENT == "stage" or COMMON_DEPLOYMENT == "edge" %}
 browser_monitoring.enabled=false
 browser_monitoring.auto_instrument=false
 browser_monitoring.attributes.enabled=false
-{% else %}
-browser_monitoring.attributes.enabled=true
-{% endif %}