[Cleanup] Remove Unused Mod Hooks (#2856)

- Removes old `mod_` hooks that have gone unused for years in favor of Lua mods.

zone/tradeskills.cpp

@@ -1110,8 +1110,6 @@ bool Client::TradeskillExecute(DBTradeskillRecipe_Struct *spec) {
 
 	const EQ::ItemData* item = nullptr;
 
-	chance = mod_tradeskill_chance(chance, spec);
-
 	if (((spec->tradeskill==75) || GetGM() || (chance > res)) || zone->random.Roll(aa_chance)) {
 
 		success_modifier = 1;
@@ -1248,8 +1246,6 @@ void Client::CheckIncreaseTradeskill(int16 bonusstat, int16 stat_modifier, float
 		}
 	}
 
-	chance_stage2 = mod_tradeskill_skillup(chance_stage2);
-
 	if (chance_stage2 > zone->random.Real(0, 99)) {
 		//Only if stage1 and stage2 succeeded you get a skillup.
 		SetSkill(tradeskill, current_raw_skill + 1);