Radio: fix an console error caused by using of an improper prop

fix "Blocked aria-hidden on a <inpit> element" problem by replacing "aria-hidden" prop with "role" prop

Author: Yinjie Wu

packages/radio/src/radio.vue

@@ -26,7 +26,7 @@
         class="el-radio__original"
         :value="label"
         type="radio"
-        aria-hidden="true"
+        role="presentation"
         v-model="model"
         @focus="focus = true"
         @blur="focus = false"