Update icon.scss (#9534)

Fix this : 
https://github.com/ElemeFE/element/issues/9086

packages/theme-chalk/src/icon.scss

@@ -2,8 +2,8 @@
 
 @font-face {
   font-family: 'element-icons';
-  src: url('#{$--font-path}/element-icons.woff?t=1510834658947') format('woff'), /* chrome, firefox */
-       url('#{$--font-path}/element-icons.ttf?t=1510834658947') format('truetype'); /* chrome, firefox, opera, Safari, Android, iOS 4.2+*/
+  src: url('#{$--font-path}/element-icons.woff') format('woff'), /* chrome, firefox */
+       url('#{$--font-path}/element-icons.ttf') format('truetype'); /* chrome, firefox, opera, Safari, Android, iOS 4.2+*/
   font-weight: normal;
   font-style: normal
 }