errors/fmt: disable failing TestPanics test on builders
errors/fmt: disable failing TestPanics test on builders

Now that golang/go#32528 has been resolved and inner modules
are being tested too, disable this failing test until it can
be fixed. We don't want to distract people trying to do other
work in x/exp with trybot failures.

Updates golang/go#30622

Change-Id: Ia6f9c2b64100c7a9056a013453caf6e6c76177ad
Reviewed-on: https://go-review.googlesource.com/c/exp/+/196034
Run-TryBot: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/exp,golang/exp,golang/exp