Next button below the fold on convert to stablesats screen on iphone

[pretyflaco]

Describe the bug "Next" button is below the fold on Convert screen on iPhone 7 (and 13 according to @nicolasburtey ) and numpad does not show next or done option - to proceed user needs to tap background to remove numpad, then scroll down

To Reproduce Steps to reproduce the behavior:

1. Go to 'Convert'
2. Enter amount
3. Next step not obvious

Expected behavior Numpad could have done button for when user is done entering amount to remove numpad from screen. User should then see active "next" button (dark blue) to proceed

Screenshots

Smartphone (please complete the following information):

• Device: iPhone 7
• bitcoin beach wallet v2.0.64
• iOS: 15.7.2