rpmmd: drop the Name attribute from RepoConfig

This was never actually used anywhere, as passing it to dnf-json
was a noop.

We may want to reconsider the concept of a source/repo name and
how it differs from an ID, but for now drop the name.

Signed-off-by: Tom Gundersen <teg@jklm.no>

cmd/osbuild-dnf-json-tests/main_test.go

@@ -46,7 +46,6 @@ func TestFetchChecksum(t *testing.T) {
 
 	repoCfg := rpmmd.RepoConfig{
 		Id:        "repo",
-		Name:      "repo",
 		BaseURL:   fmt.Sprintf("file://%s", dir),
 		IgnoreSSL: true,
 	}