Merge pull request #633 from SVG-Edit/issue/631

#631 rulers id not found , so we removed

src/editor/MainMenu.js

@@ -120,7 +120,6 @@ class MainMenu {
     this.editor.configObj.curConfig.snappingStep = gridsnappingstep;
     this.editor.configObj.curConfig.gridColor = gridcolor;
     this.editor.configObj.curConfig.showRulers = showrulers;
-    $id('rulers').style.display = (this.editor.configObj.curConfig.showRulers) ? 'block' : 'none';
     if (this.editor.configObj.curConfig.showRulers) {
       this.editor.rulers.updateRulers();
     }