Revert FOUC fix (#2991)
Revert FOUC fix (#2991)

Revert https://github.com/FreshRSS/FreshRSS/pull/2913
I have not seen any difference with/without this fix, and it might be
due to the fact that is is blocked by CSP.
At least in Chrome, it generates CSP warnings.
If it should be re-introduced, see warning suggestions:

> Refused to execute inline script because it violates the following
Content Security Policy directive: "default-src 'self'". Either the
'unsafe-inline' keyword, a hash
('sha256-gcoEgwf1rABkUXPaVY2M1RH34tUHWGDn9nAAn/kGYUE='), or a nonce
('nonce-...') is required to enable inline execution. Note also that
'script-src' was not explicitly set, so 'default-src' is used as a
fallback.
marienfressinaud/FreshRSS,romibi/FreshRSS,romibi/FreshRSS,Alkarex/FreshRSS,romibi/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,marienfressinaud/FreshRSS,FreshRSS/FreshRSS,romibi/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS,marienfressinaud/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,marienfressinaud/FreshRSS,aledeg/FreshRSS