Implement disabled or not rendered button for passphrase confirm step

[ginacontrino]

Expected behaviour

It should not be possible to go to the dashboard, without confirming your passphrase.
Also unskip the tests and make them work:
https://github.com/LiskHQ/lisk-wallet/blob/development/src/components/passphrase/confirm/index.test.js#L55

Actual behaviour

Currently, in the confirm step, the button 'get-to-your-dashboard-button' is not disabled when the missing words are incorrect or not filled in yet. Instead it is rendered with "display: none", which makes it possible to skip the step entirely and just move on to the dashboard, by displaying the button

Steps to reproduce

• Start creating a new account
• In the passphrase confirmation step, open the dev tools and display the button