Fix tests failing to load skin

We should find a better way to do this, but this works well enough.

test/components/views/rooms/SendMessageComposer-test.js

@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import '../../../skinned-sdk'; // Must be first for skinning to work
 import Adapter from "enzyme-adapter-react-16";
 import { configure, mount } from "enzyme";
 import React from "react";