fix: 用户为svg-icon图标设置auto尺寸问题 #811
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背景描述
1、原有的部分功能型icon-font图标会被组件默认转成svg图标（兼容锁定模式）
1、用户侧可能设置了公共尺寸属性，即将width和height设置为auto。
2、svg存在两个尺寸设置，一个是浏览器认为的默认尺寸，一个是组件内设定的默认尺寸。 如果用户侧设置auto后，组件的默认尺寸（1em1em）会被覆盖，而浏览器会按照默认350px150px的尺寸渲染。
主要改动
经调研，无法更改svg图标默认尺寸大小。因为将组件内svg icon的默认1em*1em存尺寸 加上!important来覆盖用户侧的auto配置。
需要注意
icon font-face的方式设置尺寸通过font-size，默认转成svg后，由于默认宽高是1em， 因此也可以通过font-size方式设定svg图标的尺寸。 原则上不需要再设置width和height属性