[Bug]: Overlapping text in advanced gas fee popover inputs

### Describe the bug

If you enter a large enough number in the advanced gas fee inputs you, the input text and the right aligned estimate overlap making both numbers impossible to read:

https://user-images.githubusercontent.com/34557516/158867872-ada4893c-f7fc-45d9-a189-6406acf2992b.mov

### Steps to reproduce

1. Enable Enhanced Gas Fee UI
2. Start any transaction
3. Go to advanced gas fee
4. Enter a large number in either input.

### Error messages or log output

_No response_

### Version

10.11.2

### Build type

_No response_

### Browser

Chrome

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

_No response_

No source file or test is identified in the issue. Reproduce by enabling Enhanced Gas Fee UI, starting a transaction, opening advanced gas fee, and entering a large number in either input; done means the entered value and right-aligned estimate remain readable without overlapping.

Written by the indexing model from the issue text.