cmd/go/testdata: remove directory badmod

It doesn't seem to be used anywhere.

Change-Id: If979b6d69c9bf5261afd980d96f67991c417d46d
Reviewed-on: https://go-review.googlesource.com/c/go/+/213218
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
diff --git a/src/cmd/go/testdata/badmod/go.mod b/src/cmd/go/testdata/badmod/go.mod
deleted file mode 100644
index f7f6423..0000000
--- a/src/cmd/go/testdata/badmod/go.mod
+++ /dev/null
@@ -1 +0,0 @@
-module m
diff --git a/src/cmd/go/testdata/badmod/x.go b/src/cmd/go/testdata/badmod/x.go
deleted file mode 100644
index 579fb08..0000000
--- a/src/cmd/go/testdata/badmod/x.go
+++ /dev/null
@@ -1,4 +0,0 @@
-package x
-
-import _ "appengine"
-import _ "nonexistent.rsc.io" // domain does not exist