Disable click-to-select in pan/zoom mode temporarily [1852]

- Reason: until clickmode attribute is not introduced, Jasmine spies in
  gl2d_plot_interact_test are expecting different default behavior.

Author: rmoestl

src/traces/scattergl/index.js

@@ -523,7 +523,7 @@ function plot(gd, subplot, cdata) {
     scene.unselectBatch = null;
     var dragmode = fullLayout.dragmode;
     // TODO get that from layout as soon as clickmode attribute has been added
-    var clickmode = 'select';
+    var clickmode = 'click';
     var selectMode = (dragmode === 'lasso' || dragmode === 'select' || clickmode === 'select');
 
     for(i = 0; i < cdata.length; i++) {