KERNEL-5830 refactor: 去除display:box

src/less/core/wrapper/flex.vertical.less

@@ -1,5 +1,4 @@
 .bi-flex-vertical-layout {
-  display: box; /* OLD - Android 4.4- */
   display: -webkit-box; /* OLD - iOS 6-, Safari 3.1-6 */
   display: -moz-box; /* OLD - Firefox 19- (buggy but mostly works) */
   display: -ms-flexbox; /* TWEENER - IE 10 */

src/less/core/wrapper/flex.wrapper.horizontal.less

@@ -1,6 +1,5 @@
 .bi-flex-scrollable-horizontal-layout {
   & .flex-scrollable-horizontal-layout-wrapper {
-    display: box; /* OLD - Android 4.4- */
     display: -webkit-box; /* OLD - iOS 6-, Safari 3.1-6 */
     display: -moz-box; /* OLD - Firefox 19- (buggy but mostly works) */
     display: -ms-flexbox; /* TWEENER - IE 10 */

src/less/core/wrapper/flex.wrapper.vertical.less

@@ -1,6 +1,5 @@
 .bi-flex-scrollable-vertical-layout {
   & .flex-scrollable-vertical-layout-wrapper {
-    display: box; /* OLD - Android 4.4- */
     display: -webkit-box; /* OLD - iOS 6-, Safari 3.1-6 */
     display: -moz-box; /* OLD - Firefox 19- (buggy but mostly works) */
     display: -ms-flexbox; /* TWEENER - IE 10 */