disown: Fix a format string

Missed in 77aeb6a2a8, this would crash otherwise.

fish-rust/src/builtins/disown.rs

@@ -107,7 +107,7 @@ pub fn disown(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr]) -> O
                     } else {
                         streams
                             .err
-                            .append(wgettext_fmt!("%ls: Could not find job '%d'\n"));
+                            .append(wgettext_fmt!("%ls: Could not find job '%d'\n", cmd, pid));
                     }
                 }
             }

tests/checks/jobs.fish

@@ -130,3 +130,6 @@ function thud --on-job-exit $truepid
     echo "thud called"
 end
 # CHECK: thud called
+
+disown 252
+# CHECKERR: disown: Could not find job '252'