Onboarding wizard deletes profile name if you chose a picture after enter the name

[matthesatox]

Describe the bug
Onboarding wizard deletes profile name if you chose a picture after enter the name.

To Reproduce
Occurrence: always
Steps to reproduce the behavior:

1. Make a clean install of OX COI
2. Open OX COI and login
3. Enter profile name BEFORE you set a picture
4. Choose a profile picture AFTER you entered your profile name

Expected behavior
The entered profile name shouldn't be deleted after choosing a profile picture.

Screenshots
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App information (please complete the following information):

• App version: 0.700.2 (518)
• Plugin version:
• Delta Chat Core version: [e.g. 0.40.0]
• Flutter version: [e.g. 1.0]

Smartphone (please complete the following information):

• Device: iPhone 11 Pro Max
• OS: iOS 13.5

Additional context
Add any other context about the problem here.

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