cmd/compile: update fmt_test.go for esc.go code cleanup
cmd/compile: update fmt_test.go for esc.go code cleanup

CL 187598 removed a bunch of esc.go's debug messages, so some format
strings are no longer needed.

Fixes #33915.

Change-Id: Iaadf12b5d68358e1abb00210f5aa8be01b36ce82
Reviewed-on: https://go-review.googlesource.com/c/go/+/192142
Run-TryBot: Matthew Dempsky <e56ac2c500064424afac424d4b5e53bd0570a731@google.com>
Reviewed-by: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

akutz/go,akutz/go,nawawi/go,CAFxX/go,akutz/go,akutz/go,CAFxX/go,cloudflare/go,akutz/go,cloudflare/go,CAFxX/go,golang/go,cloudflare/go,akutz/go,golang/go,golang/go,nawawi/go,akutz/go,golang/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,nawawi/go,cloudflare/go,CAFxX/go,nawawi/go,CAFxX/go,CAFxX/go,akutz/go,nawawi/go,CAFxX/go,golang/go,golang/go,nawawi/go,cloudflare/go,golang/go,cloudflare/go,nawawi/go,nawawi/go