Remove sending client ID and HDID in CC packet

The "select character" packet, CC, only needs one field: the character
ID you're selecting. It uses two more: a client ID and an HDID. To
select a character, you have to send your HDID every single time. This
is ridiculous, you alredy send it to the server when you join.

Remove it. I hoped to use empty strings in both unused fields to fully
erase them without breaking the packet structure, but some servers
*require* both to be present, so hardcode "0" instead.

CC doesn't need anything beyond CID. Client ID _might_ be used for
some spoofing protection, but even then it sounds far-fetched.

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