update code after review

Author: dingmeng-xue

src/Resources/Resources/ActiveDirectory/Cmdlets/UpdateAzureADApplicationCommand.cs

@@ -102,7 +102,7 @@ public override void ExecuteCmdlet()
                     Homepage = HomePage,
                     IdentifierUris = IdentifierUri,
                     ReplyUrls = ReplyUrl,
-                    AvailableToOtherTenants = MyInvocation.BoundParameters.ContainsKey("AvailableToOtherTenants") ? AvailableToOtherTenants : (bool?)null
+                    AvailableToOtherTenants = this.IsParameterBound(c => c.AvailableToOtherTenants) ? AvailableToOtherTenants : (bool?)null
                 };
 
                 if (ShouldProcess(target: ObjectId, action: string.Format("Updating an application with object id '{0}'", ObjectId)))

src/Resources/Resources/ChangeLog.md

@@ -23,6 +23,7 @@
     - Add new cmdlets for managing deployments at tenant scope: *-AzTenantDeployment
     - Refactor *-AzDeployment cmdlets to work specificly at subscription scope
     - Created aliases *-AzSubscriptionDeployment for *-AzDeployment cmdlets
+* Fix `Update-AzADApplication` when parameter `AvailableToOtherTenants` is not set 
 
 ## Version 1.10.0
 * Make -Scope optional in *-AzPolicyAssignment cmdlets with default to context subscription