Pass the remaining args to the executed interactive unit

We only support running one interactive test at a time; everything after
the unit name is to be considered an argument to the actual unit.

tests/interactive/test-main.c

@@ -195,7 +195,11 @@ main (int argc, char **argv)
 
           unit_test_main = func;
 
-          ret = unit_test_main (argc, argv);
+          ret = unit_test_main (n_unit_names, unit_names);
+
+          g_free (unit_test);
+
+          break;
         }
 
       g_free (unit_test);