Remove unnecessaty cats

src/ffoo/saturnin_www.sh

@@ -74,10 +74,10 @@ find_uri() {
         ##
         # process each pipe *async* by different filter
         #
-        cat maybe_uris  | filter_uris                     > uris &
-        cat maybe_ids   | filter_ids   | id2kw   | kw2uri > uris_from_ids &
-        cat maybe_exprs | filter_exprs | expr2kw | kw2uri > uris_from_exprs &
-        cat maybe_kws   | filter_kws   |           kw2uri > uris_from_kws &
+        < maybe_uris  filter_uris                     > uris &
+        < maybe_ids   filter_ids   | id2kw   | kw2uri > uris_from_ids &
+        < maybe_exprs filter_exprs | expr2kw | kw2uri > uris_from_exprs &
+        < maybe_kws   filter_kws   |           kw2uri > uris_from_kws &
         ##
         # print result *sync* in correct order
         #