userdbctl: don't expect argument to --fuzzy

The getopt() parser was completely wrong, it expected an argument where
wasn't expected or processes.

The test cases only passed by accident because they use the "user" verb
which is also the default verb. It would be accidently read as argument
for --fuzzy and ignored.

Fix that.

src/userdb/userdbctl.c

@@ -1227,7 +1227,7 @@ static int parse_argv(int argc, char *argv[]) {
                 { "chain",        no_argument,       NULL, ARG_CHAIN        },
                 { "uid-min",      required_argument, NULL, ARG_UID_MIN      },
                 { "uid-max",      required_argument, NULL, ARG_UID_MAX      },
-                { "fuzzy",        required_argument, NULL, 'z'              },
+                { "fuzzy",        no_argument,       NULL, 'z'              },
                 { "disposition",  required_argument, NULL, ARG_DISPOSITION  },
                 { "boundaries",   required_argument, NULL, ARG_BOUNDARIES   },
                 {}