`plz test --plain_output` eating braces

[rmillet-rs]

Hello,

I use plz with go, and I found that it is stripping braces in test output.

myfile_test.go:

func TestPlz(t *testing.T) {
	fmt.Println("XXX ${AAAA} XXX")
	t.Fail()
}

If I run directly with go:

go test -run TestPlz ./mydir/*.go
XXX ${AAAA} XXX
--- FAIL: TestPlz (0.00s)

With plz:

plz test //... --plain_output TestPlz
08:25:42.583   ERROR: //lib/go/workflow/dsl/peg:test__unit failed: XXX ${AAAA} XXX
Fail: //lib/go/workflow/dsl/peg:test__unit   0 passed   0 skipped   1 failed   0 errored Took 10ms
Failure:  in TestPlz
XXX $AAAA XXX