revert(视频号组件): 精简代码，调整样式以和后台设计统一

uni_modules/uni-datetime-picker/components/uni-datetime-picker/time-picker.vue

@@ -13,7 +13,7 @@
 		</view>
 		<view v-if="visible" id="mask" class="uni-datetime-picker-mask" @click="tiggerTimePicker"></view>
 		<view v-if="visible" class="uni-datetime-picker-popup" :class="[dateShow && timeShow ? '' : 'fix-nvue-height']"
-			:style="fixNvueBug">
+			:style="[fixNvueBug]">
 			<view class="uni-title">
 				<text class="uni-datetime-picker-text">{{selectTimeText}}</text>
 			</view>

uni_modules/uni-datetime-picker/components/uni-datetime-picker/uni-datetime-picker.vue

@@ -28,7 +28,7 @@
 
 		<view v-show="popup" class="uni-date-mask" @click="close"></view>
 		<view v-if="!isPhone" ref="datePicker" v-show="popup" class="uni-date-picker__container">
-			<view v-if="!isRange" class="uni-date-single--x" :style="popover">
+			<view v-if="!isRange" class="uni-date-single--x" :style="[popover]">
 				<view class="uni-popper__arrow"></view>
 				<view v-if="hasTime" class="uni-date-changed popup-x-header">
 					<input class="uni-date__input t-c" type="text" v-model="tempSingleDate"
@@ -49,7 +49,7 @@
 				<view class="uni-date-popper__arrow"></view>
 			</view>
 
-			<view v-else class="uni-date-range--x" :style="popover">
+			<view v-else class="uni-date-range--x" :style="[popover]">
 				<view class="uni-popper__arrow"></view>
 				<view v-if="hasTime" class="popup-x-header uni-date-changed">
 					<view class="popup-x-header--datetime">