Cancel button in profile settinsg leads to 404

[SarahW91]

Package version (if known): 3.0.0

Describe the bug

Clicking on the "Cancel" button in the user profile form or preferences form leads to "account/settings" but this is not a valid view so a 404 error is shown.

Steps to Reproduce

1. Go to /account/settings/profile
2. Click on 'Cancel'
3. See error 404 displayed because the URL "/account/settings/" has no view

Expected behavior

No error. Button leads back to the profile settings page with the original, unchanged settings.

Screenshots (if applicable)

Additional context

On the page "/account/settings/notifications/" the "Cancel" button leads back to "/account/settings/notifications/" without any error.

[Ducica]

@zzacharo @ntarocco Hello, I've made a PR for this problem https://github.com/inveniosoftware/invenio-userprofiles/pull/175/files. If it would be possible please take a look. Thank you and have a nice day.