Get-DbaDbUser, faster enumeration when targeting single db (#9623)

Author: niphlod

public/Get-DbaDbUser.ps1

@@ -103,15 +103,9 @@ function Get-DbaDbUser {
             } catch {
                 Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
             }
-
-            $databases = $server.Databases | Where-Object IsAccessible
-
-            if ($Database) {
-                $databases = $databases | Where-Object Name -In $Database
-            }
-            if ($ExcludeDatabase) {
-                $databases = $databases | Where-Object Name -NotIn $ExcludeDatabase
-            }
+            
+            
+            $databases = Get-DbaDatabase -SqlInstance $server -SqlCredential $SqlCredential -Database $Database -ExcludeDatabase $ExcludeDatabase -OnlyAccessible
 
             foreach ($db in $databases) {