tests: re-add the disambiguated `for (val in [TokenValue(`+`), TokenValue(`-`)]) {` test

vlib/v/tests/for_cond_test.v

@@ -0,0 +1,10 @@
+type TokenValue = rune | u64
+
+fn test_for_cond() {
+	val := `+`
+	for (val in [TokenValue(`+`), TokenValue(`-`)]) {
+		println('ok')
+		break
+	}
+	assert true
+}