Fix collapse arrow position in IE9/10/11

Author: afc163

components/collapse/style/index.less

@@ -49,10 +49,6 @@
         transition: transform 0.24s;
         top: 0;
         left: 16px;
-        /* stylelint-disable declaration-block-no-duplicate-properties */
-        top: ~"16px \9";
-        left: ~"0 \9";
-        /* stylelint-enable declaration-block-no-duplicate-properties */
         &:before {
           content: "\E61F";
         }