Change List[...] formatting on function parameter type-hints

[jacobchrismarsh]

When a function has enough arguments to put each parameter on its own line, and one of those parameters is a List, Set, etc. with a default argument that is not the correct type, it gets very gross looking.

Examples in the current Black style Think of some short code snippets that show
how the current Black style is not great:

Problematic style

def foo(
    really_long_arg_1_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx: int,
    string_arg: List[
        str
    ] = "some_really_long_string..........................................",
) -> int:
    return 0

Desired style How do you think Black should format the above snippets:

def foo(
    really_long_arg_1_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx: int,
    string_arg: List[str] = (
        "some_really_long_string.........................................."
    ),
) -> int:
    return 0

This is a unique case, but it is gross formatting nonetheless

[JelleZijlstra]

Duplicate of #1765