fixed little bug in configurator

lib/shared/Configurator.js

@@ -313,7 +313,10 @@ class Configurator {
     range.step = step;
 
     if (value !== undefined) {
-      if (value * 0.1 < min) {
+      if (value < 0 && value * 2 < min) {
+        range.min = value*2;
+      }
+      else if (value * 0.1 < min) {
         range.min = value / 10;
       }
       if (value * 2 > max && max !== 1) {