builtin-for-each-ref.c: check if we need to peel onion while parsing the format
builtin-for-each-ref.c: check if we need to peel onion while parsing the format

Instead of iterating over the parsed atoms that are used in the output
format after all the parsing is done, check it while parsing the
format string.

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git