Revert "small improvement to y_sort: make clear which item has to be drawn first when two have the same y-coordinate"

This reverts commit 4118b21e43c59e6abfe4f45ccf236ee529626f4e.
Same rationale as previous revert.

servers/visual/visual_server_raster.h

@@ -407,10 +407,7 @@ class VisualServerRaster : public VisualServer {
 
 		_FORCE_INLINE_ bool operator()(const CanvasItem* p_left,const CanvasItem* p_right) const {
 
-			if(Math::abs(p_left->xform.elements[2].y - p_right->xform.elements[2].y) < CMP_EPSILON )
-				return p_left->xform.elements[2].x < p_right->xform.elements[2].x;
-			else
-				return p_left->xform.elements[2].y < p_right->xform.elements[2].y;
+			return p_left->xform.elements[2].y < p_right->xform.elements[2].y;
 		}
 	};