tests/valgrind: vfmt fn_with_return_should_free_local_vars.vv

vlib/v/tests/valgrind/fn_with_return_should_free_local_vars.vv

@@ -1,6 +1,8 @@
 fn many_strings() []string {
 	mut res := []string{}
-    for i in 0..10000 { res << '${i:05}' }
+	for i in 0 .. 10000 {
+		res << '${i:05}'
+	}
 	return res
 }