Fix filter double encoding (#3563)
Fix filter double encoding (#3563)

#fix https://github.com/FreshRSS/FreshRSS/issues/3562
The content is already HTML-safe
Alkarex/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,FreshRSS/FreshRSS