update snapshots to include context

Author: nathanstitt

exercises/specs/components/__snapshots__/exercise.spec.js.snap

@@ -1733,6 +1733,13 @@ exports[`Exercises component renders and matches snapshot 1`] = `
             Author: Alene
           </div>
         </div>
+        <div
+          dangerouslySetInnerHTML={
+            Object {
+              "__html": "<h3>read this chapter first</h3>",
+            }
+          }
+        />
         <div
           className="openstax-exercise-preview exercise-editing-preview is-displaying-formats is-displaying-feedback card"
           data-exercise-id="1@1"
@@ -5049,6 +5056,7 @@ exports[`Exercises component renders with intro and a multiple questions when ex
             Author: Louvenia
           </div>
         </div>
+        
         <div
           className="openstax-exercise-preview exercise-editing-preview is-displaying-formats is-displaying-feedback card"
           data-exercise-id="9@1"

exercises/specs/components/exercise.spec.js

@@ -27,6 +27,7 @@ describe('Exercises component', () => {
     });
 
     it('renders and matches snapshot', () => {
+        exercise.context = '<h3>read this chapter first</h3>'
         expect.snapshot(<Router><Exercise {...props} /></Router>).toMatchSnapshot();
     });