Use providerName instead of policyName for exception message.

https://github.com/abpframework/abp/pull/5847

modules/feature-management/src/Volo.Abp.FeatureManagement.Application/Volo/Abp/FeatureManagement/FeatureAppService.cs

@@ -114,7 +114,7 @@ namespace Volo.Abp.FeatureManagement
                 policyName = Options.ProviderPolicies.GetOrDefault(providerName);
                 if (policyName.IsNullOrEmpty())
                 {
-                    throw new AbpException($"No policy defined to get/set permissions for the provider '{policyName}'. Use {nameof(FeatureManagementOptions)} to map the policy.");
+                    throw new AbpException($"No policy defined to get/set permissions for the provider '{providerName}'. Use {nameof(FeatureManagementOptions)} to map the policy.");
                 }
             }