apply target lock to offensive spells as default-off cSpell field

src/game/boe.newgraph.cpp

@@ -1046,10 +1046,8 @@ void handle_target_mode(eGameMode target_mode, int range, eSpell spell) {
 	// Lock on to enemies in range: 
 	if(has_feature_flag("target-lock", "V1") && get_bool_pref("TargetLock", true)){
 		// Skip this for spells that don't target enemies
-		switch(spell){
-			case eSpell::DISPEL_SQUARE: case eSpell::DISPEL_BARRIER: case eSpell::DISPEL_SPHERE:
-				return;
-		}
+		cSpell spell_info = *spell;
+		if(!spell_info.target_lock) return;
 
 		location loc = univ.current_pc().combat_pos;