Corrected issue regarding browser validation message for float number inputs

[EstFoisy]

What it does

For the preference number input if a float should be accepted in that field there will be no more a failure message showing.
Closes #11851

How to test

1. Go into file: preference: Open Setting
2. Find a field that should accept a float value
3. Enter a float value
4. There should be no message appearing
5. Try a field that should only take an integer
6. Enter a float value
7. The failure message regarding the value being incorrect should appear

Issue.11851.-.before.correction.mp4

Issue.11851.-.after.correction.mp4

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with [the review guidelines](https://github.com/theia-ide/theia/blo

[vince-fugnitto]

LGTM 👍

I confirmed that:

• integer preferences (ex: files.maxConcurrentUploads) do not accept float values
• number preferences that are integers will step by 1
• number preferences that are floats will not display the default browser validation
• the change aligns with a recent change in vscode (as they also had the bug)