[Form] Fix #6325 : Rename "always_empty" in PasswordType to "reset_on_submit"

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | [no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #10648
| License       | MIT
| Doc PR        | N/A