Use plain, no-padding button on form help icon

[srambach]

trafficstars

There are various demos and examples that use a button for the help icon on the form label - these should be changed to a plain, no padding button.

Known spots:

• [ ] Form examples
• [ ] Password strength examples

[tlabaj]

Is this for v5 or v6 @srambach

[srambach]

V6!

[thatblindgeye]

Closed by #10016