[TwigBridge] [Form] Fixed some extra empty spaces

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT
| Doc PR        | 

The extra spaces were introduced by commit https://github.com/symfony/symfony/commit/8f9ed3ebb9ef126cc8940da493f252619671c0f3 by @chrisguitarguy