Adapt to ES module conversion

This import should be hoisted to the top level of the module but a naive change to do this did not work. I suspect this relates to the circular nature of the
import, but it needs investigating. This change enables the code to
continue working until then.

src/sidebar/store/modules/drafts.js

@@ -94,7 +94,8 @@ function createDraft(annotation, changes) {
  */
 
 function deleteNewAndEmptyDrafts() {
-  const annotations = require('./annotations');
+  const { default: annotations } = require('./annotations');
+
   return (dispatch, getState) => {
     const newDrafts = getState().drafts.filter(draft => {
       return (