Enatega Rider Application : Remove text under the input field

### Describe the bug
Remove text under the input field , once user entered any amount this text line should be removed immediately once an amount is entered in the field.

### To Reproduce
Steps to reproduce the behavior:

1. Go to 'Enatega Rider Application'
2. Click on 'Wallet' menu button.
3. See error on opened screen below the input field.

###Expected behavior

1. A text message appears under the input field initially (e.g., "Please enter an amount").
2. As soon as the user types any amount, the text should disappear immediately.
3. If the user clears the input field, the text should reappear.

Smartphone (please complete the following information):

> Device: [e.g. Infinix Hot 50 ]
> OS: [e.g. Android ]
> Browser [e.g. Application]
> Version [e.g. Latest]

Start by reproducing the issue in the Enatega Rider Application through the Wallet menu and inspect that screen's input-field behavior. The initial prompt should disappear immediately when an amount is entered and reappear when the field is cleared.

Written by the indexing model from the issue text.