Update High_Weapon_Box (12818) item script. Fixes #1339

Thanks to @spinzaku

db/re/item_db.txt

@@ -6914,7 +6914,7 @@
 12815,Yggdrasil_Dust,Yggdrasil Dust,11,0,,10,,,,,0xFFFFFFFF,63,2,,,,,,{ itemskill "ECL_SEQUOIADUST",1; },{},{}
 12816,Old_Ore_Box_,Old Ore Box,2,0,,0,,,,,0xFFFFFFFF,63,2,,,60,,,{},{},{}
 12817,Old_Card_Album_,Old Card Album,2,0,,0,,,,,0xFFFFFFFF,63,2,,,80,,,{},{},{}
-12818,High_Weapon_Box_,High Weapon Box,2,0,,0,,,,,0xFFFFFFFF,63,2,,,100,,,{},{},{}
+12818,High_Weapon_Box_,High Weapon Box,2,0,,0,,,,,0xFFFFFFFF,63,2,,,100,,,{ getrandgroupitem(IG_Advanced_Weapons_Box,1); },{},{}
 12819,Zherlthsh_Tck_Box_,Zherlthsh Tck Box,2,0,,0,,,,,0xFFFFFFFF,63,2,,,150,,,{ getitem 6184,1; },{},{}
 12820,Mao_Guai_Scroll,Mao Guai Scroll,2,20,,10,,,,,0xFFFFFFFF,63,2,,,,,,{ mercenary_create 2348,1800000; },{},{}
 12821,Loli_Ruri_Scroll,Loli Ruri Scroll,2,20,,10,,,,,0xFFFFFFFF,63,2,,,,,,{ mercenary_create 2349,1800000; },{},{}