[ruby/prism] Fix parser translator when pinning hash with string keys

`StringNode` and `SymbolNode` don't have the same shape
(`content` vs `value`) and that wasn't handled.

I believe the logic for the common case can be reused.
I simply left the special handling for implicit nodes in pattern matching
and fall through otherwise.

NOTE: patterns.txt is not actually tested at the moment,
because it contains syntax that `parser` mistakenly rejects.
But I checked manually that this doesn't introduce other failures.
https://github.com/whitequark/parser/pull/1060

https://github.com/ruby/prism/commit/55adfaa895

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