internal/openvex: update handler test

Updates handler tests to have more accurate package paths.
This doesn't affect anything right now, but will be relevant for
future features/testing.

Change-Id: Ia72c749cdaf263d2a425f349f72630cda576b5f0
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/598593
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Zvonimir Pavlinovic <zpavlinovic@google.com>

internal/openvex/handler_test.go

@@ -27,7 +27,7 @@ func TestFinding(t *testing.T) {
 					Trace: []*govulncheck.Frame{
 						{
 							Module:  "mod",
-							Package: "pkg",
+							Package: "mod/pkg",
 						},
 					},
 				},
@@ -36,7 +36,7 @@ func TestFinding(t *testing.T) {
 					Trace: []*govulncheck.Frame{
 						{
 							Module:   "mod",
-							Package:  "pkg",
+							Package:  "mod/pkg",
 							Function: "func",
 						},
 					},