Fix typecheck test error message

extra characters due to whitespace differences

test/typecheck/main_test.go

@@ -43,7 +43,7 @@ var packageCases = []struct {
 		if err != unix.ENXIO {
 			panic("woops")
 		}
-	}`, map[string]string{"linux/amd64": "", "windows/amd64": "test.go:4:13: ENXIO not declared by package unix"}},
+	}`, map[string]string{"linux/amd64": "", "windows/amd64": "test.go:4:18: ENXIO not declared by package unix"}},
 	// Fixed in #51984
 	{`import "golang.org/x/sys/unix"
 	const linuxHugetlbfsMagic = 0x958458f6