Parentheses around condition in if with 'is not' drops the not keyword

[portlek]

When formatting code with parentheses around the condition, is not is incorrectly converted to is, dropping the not keyword.

Input:

func _test(test: Variant) -> void:
    if (test is not Array):
        return

Output:

func _test(test: Variant) -> void:
	if (test is Array):
		return

Expected:
is not should remain is not regardless of parentheses.

Note:
This only happens when the condition is wrapped in parentheses. Without parentheses, is not formats correctly.