Removed Gunslinger Mine Damage Delay (#8517)

- Gunslinger Mine no longer has damage delay
- Freeze from Cryo Sphere / Ice Bullet will no longer be immediately broken by its own damage
- Fixes #8516

src/map/skill.cpp

@@ -3580,7 +3580,7 @@ int64 skill_attack (int attack_type, struct block_list* src, struct block_list *
 	dmg = battle_calc_attack(attack_type,src,bl,skill_id,skill_lv,flag&0xFFF);
 
 	//If the damage source is a unit, the damage is not delayed
-	if (src != dsrc && skill_id != GS_GROUNDDRIFT)
+	if (src != dsrc)
 		dmg.amotion = 0;
 
 	//! CHECKME: This check maybe breaks the battle_calc_attack, and maybe need better calculation.