Users are unable to edit numerical values inserted from memory

Describe the bug Users are unable to edit numerical values inserted from memory.

Steps To Reproduce

1. Perform a calculation in Standard or Scientific mode so that a result is generated
2. Press "MS" button to store memory entry
3. Press ESC to clear input
4. Press "MR" button to recall stored memory entry
5. Press Backspace and notice that you cannot edit the numerical value

Note: This is only kind of related to #519, but in this case, we are only ever restoring numerical values, and not operators.

Expected behavior Numerical values are editable as if you typed them in manually.

Screenshots N/A

Device and Application Information

• OS Build: 10.0.18942.0
• Architecture: X64
• Application Version: 10.1906.25.0
• Region: en-US
• Dev Version Installed: True

Requested Assignment I'm just reporting this problem. I don't want to fix it.