Don't silence errors in fish_key_bindings/fish_user_key_bindings

We silence erros from the key binding function since 2c5151bb78 (Fix
bug in key binding code causing unneeded error messages, 2007-10-31).

Reasons are
1. fish_key_bindings is not a valid function
2. fish_key_bindings runs "bind -k" for things that are not supported (#1155)

Both reasons are obsolete:
1. we already check that earlier
2. "-k" is gone. (Also, we could have silenced "bind -k" invocations instead).

share/functions/__fish_config_interactive.fish

@@ -117,11 +117,10 @@ end" >$__fish_config_dir/config.fish
         end
         set -g __fish_active_key_bindings "$fish_key_bindings"
         set -g fish_bind_mode default
-        # Redirect stderr per #1155
-        $fish_key_bindings 2>/dev/null
+        $fish_key_bindings
         # Load user key bindings if they are defined
         if functions --query fish_user_key_bindings >/dev/null
-            fish_user_key_bindings 2>/dev/null
+            fish_user_key_bindings
         end
     end