BUG: When user press back on 'Verify Identify' can't cancel the action [JIRA PM-785]

[mmv08]

THIS IS A BUG MIGRATED FROM JIRA. IT NEEDS TO BE REPRODUCED AND CONFIRMED FIRST

Steps:
1-Go to https://trading.staging.gnosisdev.com/
2-Login in Metamask
3-Fill the fields and select Verify
4-Sign the transaction on Metamask
5-Select Verify Identify
6-Select an option
7-Press back

Expected result: The user is back to the home

Obtained result:The user only can press 'Verify identity' but no cancel the action or back to the home