go/parser: match go/defer error message of syntax package

go/parser: match go/defer error message of syntax package

Adjust corresponding type checker tests accordingly.

For #54511.

Change-Id: Ieaf29f26c0877973fc0acbde35292cd69a4b709c
Reviewed-on: https://go-review.googlesource.com/c/go/+/425007
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>