[Fix #9689] Treat parens around array items the same for children and deeper descendants

[dvandersluis]

Previously there was a disparity between these two code blocks:

[
 (
   1
 ),
 2
]

[
 x = (
   1
 ),
 y = 2
]

The first was accepted as "plausible" but the second registered an offense (and was autocorrected to a syntax error because the comma in an array cannot be on its own line).

This change allows both to be treated the same by looking for any ancestor to be an array or hash rather than just the direct parent.

---

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[bbatsov]

Looks good! Thanks!