test: update for gofrontend error message changes

fixedbugs/bug195.go:9:20: error: interface contains embedded non-interface
fixedbugs/bug195.go:12:20: error: interface contains embedded non-interface
fixedbugs/bug195.go:15:22: error: interface contains embedded non-interface
fixedbugs/bug195.go:18:9: error: invalid recursive interface
fixedbugs/bug195.go:26:9: error: invalid recursive interface

fixedbugs/bug251.go:15:9: error: invalid recursive interface

fixedbugs/issue23823.go:15:9: error: invalid recursive interface

Change-Id: If4c22430557459d5b361beda7168f8cb42b58811
Reviewed-on: https://go-review.googlesource.com/c/go/+/278512


Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>