Remove Spaceless Block From Textarea Widgets

Leaving it in can only mangle values from data bound to the form.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11277
| License       | MIT
| Doc PR        | 

The tests pass here, but it doesn't seem like any tests really cover the actual rendering.
if we agree to use group it should probably be the full url.
but https://github.com/chrisguitarguy/symfony/blob/bug_11277/src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php#L1219 just uses a comment