Corrected an uninitialized variable when adding an item

- The .favorite field of newly added inventory items wasn't correctly
  initialized to zero, potentially causing data loss (fixes
  bugreport:7854, thanks to Vincent, GrumpyPanda).

Signed-off-by: Haru <haru@dotalux.com>
Fixed a missing/incorrect check in the Moscovia Whale quest

- Most of the checks for the GUSLI accessory were completely
  ineffective, and could be bypassed by wearing any accessory.
- Replaced numeric item ID with the item DB constant.

Signed-off-by: Haru <haru@dotalux.com>
Update JOB_REBELLION 'job_db1.txt' to its official values and some mini adjustment.

Signed-off-by: malufett <malufett.eat.my.binaries@gmail.com>