crypto/bio/bio_print.c: no prefix for zero value in alternative form

crypto/bio/bio_print.c: no prefix for zero value in alternative form

Per [1] (emphasis is added):

    - For o conversion, it shall increase the precision,
      **if and only if necessary**, to force the first digit of the result
      to be a zero (**if the value and precision are both 0,
      a single 0 is printed**).
    - For x or X conversion specifiers, a **non-zero** result shall have
      0x (or 0X) prefixed to it.

[1] https://pubs.opengroup.org/onlinepubs/9799919799//functions/printf.html

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28177)