Allow valid integers (10) and floats (10.5) in Number fields

[jakejackson1]

Description

Any strings that start with a number but is invalid will also be set to 0.

Testing instructions

1. Set font size to 9pt, save.
2. View PDF
3. Set font size to 9.5pt, save.
4. View PDF

Checklist:

• [x] I've tested the code.
• [ ] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [ ] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.06%. Comparing base (364fc70) to head (e67fb25). Report is 1 commits behind head on hot-patch-6.11.2.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## hot-patch-6.11.2 #1569 +/- ## ================================================= Coverage 76.05% 76.06% ================================================= Files 248 248 Lines 12999 13001 +2 Branches 370 370 ================================================= + Hits 9887 9889 +2 Misses 3104 3104 Partials 8 8 ```

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