fix(H5): 导航栏type为transparent时button为left的时候不居中问题

src/platforms/h5/components/page/pageHead.vue

@@ -16,6 +16,7 @@
             class="uni-btn-icon"
           >&#xe601;</i>
         </div>
+        <div class="uni-page-head-ft">
           <template v-for="(btn,index) in btns">
             <div
               v-if="btn.float === 'left'"
@@ -34,6 +35,7 @@
             </div>
           </template>
         </div>
+      </div>
       <div
         v-if="!searchInput"
         class="uni-page-head-bd"