Fixed binary representation typo in comment

[brennennen]

Digging around in scene_multiplayer.h, I saw a couple comments that contradicted each other.

// Extract the `packet_type` from the LSB three bits:
uint8_t packet_type = p_packet[0] & CMD_MASK;
...
enum {
   CMD_MASK = 7, // 0x7 -> 0b00001111
};

The packet_type comment mentions "packet_type" is extracted from 3 bits, however the corresponding mask had a comment claiming 4 bits are set high. Looks like the CMD_MASK comment has a simple typo/off by one error, 0x7 is 0b0111 not 0b1111.

Feel free to ignore this if it is too nit-picky.

[akien-mga]

Thanks!