dashboard: re-enable cmd/go build test on js/wasm

Most tests will be skipped anyway because 'go build' is not available.
But this at least ensures cmd/go will build for js/wasm after
https://go.dev/cl/433480 is submitted.

For golang/go#54219

Change-Id: I5f9b647973e7ee9a5849e1ce2818986794edc2c4
Reviewed-on: https://go-review.googlesource.com/c/build/+/434235
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index 5a8f26f..4ccb534 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -1879,7 +1879,7 @@
 					return false
 				}
 				switch distTest {
-				case "cmd/go", "nolibgcc:crypto/x509", "reboot":
+				case "nolibgcc:crypto/x509", "reboot":
 					return false
 				}
 			}