pidgin/pidgin

Fix some new warnings in zephyr.

2021-01-26, Elliott Sales de Andrade
611ae5d8a232
Fix some new warnings in zephyr.

* The `ZSubscription_t` struct uses non-const pointers, but we aren't doing anything with them really, so just cast the things we're inserting.
* The removed `zephyr` variable already exists higher up in the function.

Testing Done:
Compile

Reviewed at https://reviews.imfreedom.org/r/457/
#define PIDGIN_ICON 104
#define PIDGIN_TRAY_AVAILABLE_4BIT 105
#define PIDGIN_TRAY_AWAY_4BIT 106
#define PIDGIN_TRAY_BUSY_4BIT 107
#define PIDGIN_TRAY_XA_4BIT 108
#define PIDGIN_TRAY_OFFLINE_4BIT 109
#define PIDGIN_TRAY_CONNECTING_4BIT 110
#define PIDGIN_TRAY_PENDING_4BIT 111
#define PIDGIN_TRAY_INVISIBLE_4BIT 112