GReader API consistent default category (#2840)
GReader API consistent default category (#2840)

* GReader API consistent default category

#Fix https://github.com/FreshRSS/FreshRSS/issues/2839

* Also for subscription/list
Alkarex/FreshRSS,marienfressinaud/FreshRSS,romibi/FreshRSS,FreshRSS/FreshRSS,FreshRSS/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,marienfressinaud/FreshRSS,Alkarex/FreshRSS,romibi/FreshRSS,aledeg/FreshRSS,romibi/FreshRSS,FreshRSS/FreshRSS,marienfressinaud/FreshRSS,aledeg/FreshRSS,aledeg/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS