[Form] Removed constructor argument from FormTypeHttpFoundationExtension for forward compatibility with 2.5

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This argument was introduced in #11924. No release was made of the 2.3 branch after merging that PR.

Since a different constructor argument (`$requestHandler`) was added to FormTypeHttpFoundationExtension in the 2.5 branch, we cannot merge this forward in a BC fashion. For this reason, I removed the argument again.