cli/registry/client: AuthorizeRequest(): remove name for unused arg (revive)

This method implements the interface defined in distribution, but doesn't
use the argument.

    cli/registry/client/endpoint.go:123:69: unused-parameter: parameter 'params' seems to be unused, consider removing or renaming it as _ (revive)
    func (th *existingTokenHandler) AuthorizeRequest(req *http.Request, params map[string]string) error {
                                                                        ^

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 9252fae838)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/registry/client/endpoint.go

@@ -120,7 +120,7 @@ type existingTokenHandler struct {
 	token string
 }
 
-func (th *existingTokenHandler) AuthorizeRequest(req *http.Request, params map[string]string) error {
+func (th *existingTokenHandler) AuthorizeRequest(req *http.Request, _ map[string]string) error {
 	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", th.token))
 	return nil
 }