Default Youtube videos to off

- previously the consent cookie was always set (to reject all cookies) prior to user choice
- now that we're not doing that, the code that turns links to Youtube videos in govspeak content into embedded videos was checking for the consent cookie, not finding it, and defaulting to... true.
- this meant that videos were appearing on a page before users had consented to cookies
- setting the default value to false seems to be the simplest way to fix this. Videos still initialise automatically as before once cookies are consented to

app/assets/javascripts/govuk_publishing_components/lib/govspeak/youtube-link-enhancement.js

@@ -163,7 +163,7 @@
 
   YoutubeLinkEnhancement.prototype.campaignCookiesAllowed = function () {
     var cookiePolicy = window.GOVUK.getConsentCookie()
-    return cookiePolicy !== null ? cookiePolicy.campaigns : true
+    return cookiePolicy !== null ? cookiePolicy.campaigns : false
   }
 
   YoutubeLinkEnhancement.nextId = function () {

spec/javascripts/components/govspeak-spec.js

@@ -9,6 +9,14 @@ describe('Govspeak', function () {
   })
 
   describe('youtube enhancement', function () {
+    beforeEach(function () {
+      window.GOVUK.cookie('cookies_policy', '{"essential":true,"settings":true,"usage":true,"campaigns":true}')
+    })
+
+    afterEach(function () {
+      window.GOVUK.cookie('cookies_policy', null)
+    })
+
     it('embeds youtube videos', function () {
       container = document.createElement('div')
       container.innerHTML =

spec/javascripts/govuk_publishing_components/lib/govspeak/youtube-link-enhancement-spec.js

@@ -6,14 +6,16 @@ describe('Youtube link enhancement', function () {
     var container
 
     beforeEach(function () {
+      window.GOVUK.cookie('cookies_policy', '{"essential":true,"settings":true,"usage":true,"campaigns":true}')
       container = document.createElement('div')
     })
 
     afterEach(function () {
+      window.GOVUK.cookie('cookies_policy', null)
       document.body.removeChild(container)
     })
 
-    it('replaces a link and it\'s container with a media-player embed', function () {
+    it('replaces a link and its container with a media-player embed', function () {
       container.innerHTML =
         '<div class="gem-c-govspeak govuk-govspeak" data-module="govspeak">' +
           '<p><a href="https://www.youtube.com/watch?v=0XpAtr24uUQ">Agile at GDS</a></p>' +
@@ -124,14 +126,16 @@ describe('Youtube link enhancement', function () {
     var container
 
     beforeEach(function () {
+      window.GOVUK.cookie('cookies_policy', '{"essential":true,"settings":true,"usage":true,"campaigns":true}')
       container = document.createElement('div')
     })
 
     afterEach(function () {
+      window.GOVUK.cookie('cookies_policy', null)
       document.body.removeChild(container)
     })
 
-    it('replaces a livestream link and it\'s container with a media-player embed', function () {
+    it('replaces a livestream link and its container with a media-player embed', function () {
       container.innerHTML =
         '<div class="gem-c-govspeak govuk-govspeak" data-module="govspeak">' +
           '<p><a href="https://www.youtube.com/embed/live_stream?channel=UCoMdktPbSTixAyNGwb-UYkQ">Livestream</a></p>' +