调整notice bar line-height (#507)

之前的文字底部有些遮挡

renard-wx/components/notice-bar/index.wxss

-.van-notice-bar{display:-webkit-box;display:-webkit-flex;display:flex;padding:9px 10px;font-size:12px;line-height:1.5}.van-notice-bar--within-icon{position:relative;padding-right:30px}.van-notice-bar__left-icon{height:18px;min-width:20px;padding-top:1px;box-sizing:border-box}.van-notice-bar__left-icon>image{width:16px;height:16px}.van-notice-bar__right-icon{position:absolute;top:10px;right:10px;font-size:15px;line-height:1}.van-notice-bar__content-wrap{position:relative;-webkit-box-flex:1;-webkit-flex:1;flex:1;height:18px;overflow:hidden}.van-notice-bar__content{position:absolute;white-space:nowrap}
+.van-notice-bar{display:-webkit-box;display:-webkit-flex;display:flex;padding:9px 10px;font-size:12px;line-height:1}.van-notice-bar--within-icon{position:relative;padding-right:30px}.van-notice-bar__left-icon{height:18px;min-width:20px;padding-top:1px;box-sizing:border-box}.van-notice-bar__left-icon>image{width:16px;height:16px}.van-notice-bar__right-icon{position:absolute;top:10px;right:10px;font-size:15px;line-height:1}.van-notice-bar__content-wrap{position:relative;-webkit-box-flex:1;-webkit-flex:1;flex:1;height:18px;overflow:hidden}.van-notice-bar__content{position:absolute;white-space:nowrap}
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