[TwigBridge] [Form] Fixed some extra empty spaces
minor #11554 [TwigBridge] [Form] Fixed some extra empty spaces (eiannone)

This PR was squashed before being merged into the 2.3 branch (closes #11554).

Discussion
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[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        | -

Extra empty spaces for choice_widget_collapsed, they were introduced by commit https://github.com/symfony/symfony/commit/8f9ed3ebb9ef126cc8940da493f252619671c0f3 by @chrisguitarguy

Commits
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16bd88e [TwigBridge] [Form] Fixed some extra empty spaces