Fix printing separator in objects with prettier-ignore #3448
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When trying to fix a bug of double printing separators in TypeScript interfaces in combination with
//prettier-ignore, #3103 introduced a regression of not printing commas in regular objects. This commit restricts the "not print" the separator for TypeScript only. The problem is the parser considers the trailing;part of the node, but not,for objects - so when prettier prints the node as-is, sometimes it prints the separator, sometimes it doesn't.Added a regression test + more tests for the TS bug