filter rework break about page

[Christian Hesse]

Hello everybody,

commit 'filters: Simplify converters' (525c815) breaks the about page, it is
simply empty. Reverting the patch restores the expected behavior. I did not
yet analyze the issue.
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Chris           get my mail address:    */=0;b=c[a++];)
putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}
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