Added missing renames of settings groups

refs https://github.com/TryGhost/Ghost/issues/10318, 6d83c30f01

- the mocked settings endpoint was not returning any settings created with the old `blog` key which broke tests

ghost/admin/mirage/config/settings.js

@@ -27,7 +27,7 @@ export default function mockSettings(server) {
             if (db.settings.where({key}).length > 0) {
                 db.settings.update({key}, newSetting);
             } else {
-                newSetting.type = newSetting.type || 'blog';
+                newSetting.type = newSetting.type || 'site';
                 db.settings.insert(newSetting);
             }
         });

ghost/admin/tests/acceptance/content-test.js

@@ -171,7 +171,7 @@ describe('Acceptance: Content', function () {
 
         it('can navigate to custom views', async function () {
             this.server.create('setting', {
-                type: 'blog',
+                type: 'site',
                 key: 'shared_views',
                 value: JSON.stringify([{
                     route: 'posts',

ghost/admin/tests/integration/services/feature-test.js

@@ -11,7 +11,7 @@ function stubSettings(server, labs, validSave = true) {
     let settings = [
         {
             id: '1',
-            type: 'blog',
+            type: 'labs',
             key: 'labs',
             value: JSON.stringify(labs)
         }