CreateImageWizard: insert new compose on top of images list

The composeAdded action includes a field 'insert'. When set to true
`insert` will place the added compose at the beginning of the images
list. The test is modified so the new composes are added to the
beginning of the list.

src/Components/CreateImageWizard/CreateImageWizard.js

@@ -126,7 +126,7 @@ const CreateImageWizard = () => {
                     ...response,
                     request,
                     image_status: { status: 'pending' }
-                }));
+                }, true));
             })))
                 .then(() => {
                     history.push('/landing');