Don't remove referer policy from img tag

[SettingDust]

• [x] I have read this document: https://miniflux.app/opinionated.html#feature-request

Miniflux will remove the referrerpolicy from img tag in description.

Such as img tag in https://rsshub.app/weibo/user/1642909335 <img style="" src="https://tvax1.sinaimg.cn/large/001NbtLFly1hky7l95odoj60yi32g4qq02.jpg" referrerpolicy="no-referrer"> will be <img src="https://tvax1.sinaimg.cn/large/001NbtLFly1hky7l95odoj60yi32g4qq02.jpg" loading="lazy"> that will blocked with 403

[spin6lock]

Vote for this, it would be better that we can set the referrer per feed