refactor: make the wait icon clearer

src/views/device/detail/components/Running.vue

@@ -5,7 +5,7 @@
       <span class="l-flex__fill c-runtime__title u-ellipsis">状态</span>
       <i
         v-if="asking"
-        class="l-flex__none el-icon-loading"
+        class="l-flex__none el-icon-loading u-color--black"
       />
       <i
         v-else

src/views/device/detail/components/ScreenShot.vue

@@ -5,7 +5,7 @@
       <span class="l-flex__fill c-runtime__title u-ellipsis">截屏</span>
       <i
         v-if="asking"
-        class="l-flex__none el-icon-loading"
+        class="l-flex__none el-icon-loading u-color--black"
       />
       <i
         v-else