Input: not display clear icon in disabled form (ElemeFE#13208)

Author: ziyoung

packages/input/src/input.vue

@@ -205,7 +205,7 @@
       },
       showClear() {
         return this.clearable &&
-          !this.disabled &&
+          !this.inputDisabled &&
           !this.readonly &&
           this.currentValue !== '' &&
           (this.focused || this.hovering);