pidl: Wireshark: Remove init of proto variables

pidl: Wireshark: Remove init of proto variables

Pick up change from Wireshark as it applies to PIDL:

    commit 2a9bc63325c99653c5da873c273430add3b5e9dd
    Author: Stig Bjørlykke <stig@bjorlykke.org>
    Date:   Mon Nov 20 08:16:40 2023 +0100

        Remove init of proto variables

        Remove init of proto, header field, expert info and subtree variables.
        This will reduces the binary size by approximate 1266320 bytes due to
        using .bss to zero-initialize the fields.

        The conversion is done using the tools/convert-proto-init.py script

Signed-off-by: John Thacker <johnthacker@gmail.com>
Reviewed-by: Jo Sutton <josutton@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>