Ask water map if we're in a zoneline to prevent false positives

I don't think this should open up any chance to exploit
Trying to use a ZL to go somewhere else is still detected etc

This should really cut down on false positives and we really can't
see real cheater from all the noise this creates

zone/water_map.h

@@ -34,6 +34,7 @@ public:
 	virtual bool InLava(const glm::vec3& location) const = 0;
 	virtual bool InLiquid(const glm::vec3& location) const = 0;
 	virtual bool InPvP(const glm::vec3& location) const = 0;
+	virtual bool InZoneLine(const glm::vec3& location) const = 0;
 
 protected:
 	virtual bool Load(FILE *fp) { return false; }