fix: the problem that changing the theme color does not work because of cache reasons 🌟

修复: 缓存原因导致主题色更换不生效的问题；

src/utils/themeUtil.js

@@ -18,9 +18,6 @@ module.exports = {
   changeThemeColor (newColor) {
     let lastColor = this.lastColor || this.primaryColor
     let options = {
-      changeUrl (cssUrl) {
-        return `/${cssUrl}` // while router is not `hash` mode, it needs absolute path
-      },
       oldColors: this.getThemeColors(lastColor),
       newColors: this.getThemeColors(newColor)
     }