Editing register multisignature group form invalidates the inputs

[reyraa]

Expected behavior

If I click on the edit button in the summary step of the register multisignature group screen, I should be able to (optionally) apply changes and proceed to the summary step.

Actual behavior

The public keys I entered for members turn to addresses, and the form becomes invalid.

Steps to reproduce

• Open register multisignature group modal.
• Enter two public keys.
• Proceed to the summary screen.
• Click edit
• Now you see LSK addresses in members' inputs and the form is invalid.

Which version(s) does this affect? (Environment, OS, etc...)

2.0.0-beta.4