Removed ember component test

No ref
- This will be replaced by snapshot tests

ghost/admin/tests/integration/components/modal-post-history-test.js

@@ -1,27 +0,0 @@
-import {describe, it} from 'mocha';
-import {expect} from 'chai';
-import {find, render} from '@ember/test-helpers';
-import {hbs} from 'ember-cli-htmlbars';
-import {setupRenderingTest} from 'ember-mocha';
-
-describe('Integration | Component | modal-post-history', function () {
-    setupRenderingTest();
-
-    it('renders', async function () {
-    // Set any properties with this.set('myProperty', 'value');
-    // Handle any actions with this.set('myAction', function(val) { ... });
-
-        await render(hbs`<ModalPostHistory />`);
-
-        expect(find('h2').textContent.trim()).to.equal('Post History');
-
-        // Template block usage:
-        await render(hbs`
-      <ModalPostHistory>
-        template block text
-      </ModalPostHistory>
-    `);
-
-        expect(find('h2').textContent.trim()).to.equal('Post History');
-    });
-});