Fix：3952 【商城小程序】评论输入框跟随文本长度自适应变化

pagesInn/inn/innInfoDetail.vue

@@ -163,6 +163,8 @@
           @focus="commentInputFocus"
           @change="commentInputChange" 
           :prefixIcon="prefixIcon" 
+          :maxlength="500"
+          :maxheight="200"
           class="comment-input" 
           :showConfirmBar="false"
           cursorSpacing="15"

pkg_common/views/message.vue

@@ -61,9 +61,11 @@
       <view style="width: 100%">
         <u-textarea
           v-model="content"
+          :maxlength="500"
           @blur="onBlur"
           @focus="commentInputFocus"
           @change="commentInputChange"
+          :maxheight="200"
           :showConfirmBar="false"
           :focus="autoFocus"
           autoHeight