[PS] Update network picker on wallet screen

[Cal-L]

Description

Update network picker on wallet screen

Technical Details

• Update nav bar on Wallet screen to use PickerNetwork component

Acceptance Criteria

• Nav bar on Wallet screen should be using PickerNetwork component
• Functionality pre and post update should remain the same. In other words, Network switching logic should remain the same

Scenario: xxxx

• GIVEN a user is in x state
• WHEN a user does x
• AND a user does x
• THEN x should occur

References

• Figma - https://www.figma.com/file/LRpO3E6SFcNs6KXCfolwyM/Permissions-System---Intermediate-Design?node-id=342%3A3436