Use SAT endpoint to validate if SAT is allowed

This should fix: #466
And is tested with: OpenConext/OpenConext-devconf#41
Change in client bundle: OpenConext/Stepup-Middleware-clientbundle#99

Author: pablothedude

composer.lock

@@ -36,7 +36,7 @@ public function mayRegisterSelfAssertedTokens(Identity $identity): bool
 
     public function maySelfVetSelfAssertedTokens(Identity $identity): bool
     {
-        return $this->authorizationService->assertRegistrationOfSelfAssertedTokensIsAllowed($identity);
+        return $this->authorizationService->assertSelfVettingOfSelfAssertedTokensIsAllowed($identity);
     }
 
     public function mayRegisterRecoveryTokens(Identity $identity): bool