Fix formatting issues around object initializers

[elachlan]

Actual behavior

Code generated with object initializers seem to be indented and formatted incorrectly.

Expected behavior

proper indentation

Repro steps

1. NativeMethods.txt content:

SYSTEMTIME

2. NativeMethods.json content (if present):

3. Any of your own code that should be shared?

Context

• CsWin32 version: [e.g. 0.4.422-beta]
• Win32Metadata version (if explicitly set by project):
• Target Framework: [e.g. netstandard2.0]
• LangVersion (if explicitly set by project): [e.g. 9]

Related: #672, #648