[Bug Fix] Harm Touch Critical Ratio (#3915)

* [Bug] HT Crit Ratio

This is used to tune and bring HT Crits more in line with the correct values as proven in screenshots.

* requested changes

* mistakenly kept mob::

common/spdat.cpp

@@ -769,6 +769,13 @@ bool IsValidSpell(uint32 spell_id)
 	return false;
 }
 
+bool IsHarmTouchSpell(uint16 spell_id)
+{
+	return spell_id == SPELL_HARM_TOUCH ||
+		   spell_id == SPELL_HARM_TOUCH2 ||
+		   spell_id == SPELL_IMP_HARM_TOUCH;
+}
+
 // returns the lowest level of any caster which can use the spell
 uint8 GetSpellMinimumLevel(uint16 spell_id)
 {