Remove https from Snowplow Collector URI placeholder

Protocol is configured using the forceSecureTracker option during
tracker initialization which is enforced anyway.

ee/app/views/admin/application_settings/_snowplow.html.haml

@@ -9,7 +9,7 @@
           Enable Snowplow
     .form-group
       = f.label :snowplow_collector_uri, 'Collector URI', class: 'label-light'
-      = f.text_field :snowplow_collector_uri, class: 'form-control', placeholder: 'https://snowplow.example.com'
+      = f.text_field :snowplow_collector_uri, class: 'form-control', placeholder: 'snowplow.example.com'
     .form-group
       = f.label :snowplow_site_id, class: 'label-light' do
         Site ID

ee/changelogs/unreleased/snowplow_fix_uri_placeholder.yml

+---
+title: Remove https from Snowplow Collector URI placeholder in Admin Areawq
+merge_request: 6886
+author:
+type: fixed