chore(demo): remove padding that conflicts with auto-resize

Author: ghiscoding

frameworks/angular-slickgrid/src/styles.scss

@@ -134,9 +134,6 @@ $button-style-bg-color: #fff;
   height: calc(100vh - 56px);
   padding: 0 20px;
 
-  #demo-container {
-    padding-bottom: 15px;
-  }
   h3 {
     color: #333;
   }