rm obsolete scattergl scene clearSelect (confirmed by @dy)

Author: etpinard

src/plots/cartesian/select.js

@@ -364,12 +364,6 @@ function updateSelectedState(gd, searchTraces, eventData) {
             trace = searchTraces[i].cd[0].trace;
             delete trace.selectedpoints;
             delete trace._input.selectedpoints;
-
-            // delete scattergl selection
-            // TODO commenting out, doesn't do anything
-            if(searchTraces[i].cd[0].t && searchTraces[i].cd[0].t.scene) {
-                searchTraces[i].cd[0].t.scene.clearSelect();
-            }
         }
 
         // FIXME: make sure there is no better way to clear selection for sploms

src/traces/scattergl/index.js

@@ -280,16 +280,6 @@ function sceneUpdate(gd, subplot) {
             }
         };
 
-        // remove selection
-        scene.clearSelect = function clearSelect() {
-            if(!scene.selectBatch) return;
-            scene.selectBatch = null;
-            scene.unselectBatch = null;
-            scene.scatter2d.update(scene.markerOptions);
-            scene.clear();
-            scene.draw();
-        };
-
         // remove scene resources
         scene.destroy = function destroy() {
             if(scene.fill2d) scene.fill2d.destroy();