parseargs: don't use arg->size with GooString argument
40b56994 added GooString arguments but incorrectly used arg->size as the string length. arg->size is always 0 for GooString arguments. This worked because the arg->size - 1 string length passed to GooString::Set() just happened to be the the same value as the CALC_STRING_LEN default argument indicating the string length is to be calculated with strlen.
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