check los slightly above ground

this matches code used for blink

Author: Gamemechanicwow

src/game/Maps/PathFinder.cpp

@@ -1109,12 +1109,20 @@ void PathInfo::CutPathWithDynamicLoS()
     Vector3 out;
     // We have always keep at least 2 points (else, there is no mvt !)
     for (uint32 i = 1; i <= maxIndex; ++i)
-        if (m_sourceUnit->GetMap()->GetDynamicObjectHitPos(m_pathPoints[i - 1], m_pathPoints[i], out, -0.1f))
+    {
+        Vector3 start = m_pathPoints[i - 1];
+        Vector3 end = m_pathPoints[i];
+        start.z += 1.0f;
+        end.z += 1.0f;
+
+        if (m_sourceUnit->GetMap()->GetDynamicObjectHitPos(start, end, out, -0.1f))
         {
+            out.z -= 1.0f;
             m_pathPoints[i] = out;
             m_pathPoints.resize(i + 1);
             break;
         }
+    }
 }
 
 float PathInfo::Length() const