Remove duplicate column from from schema.rb

This was the result of a bad merge

db/schema.rb

@@ -231,7 +231,6 @@ ActiveRecord::Schema.define(version: 2019_08_02_235445) do
     t.integer "raw_blob_request_limit", default: 300, null: false
     t.boolean "allow_local_requests_from_web_hooks_and_services", default: false, null: false
     t.boolean "allow_local_requests_from_system_hooks", default: true, null: false
-    t.string "snowplow_collector_hostname"
     t.index ["custom_project_templates_group_id"], name: "index_application_settings_on_custom_project_templates_group_id"
     t.index ["file_template_project_id"], name: "index_application_settings_on_file_template_project_id"
     t.index ["usage_stats_set_by_user_id"], name: "index_application_settings_on_usage_stats_set_by_user_id"