Adding new me-central-1 AWS region

(cherry picked from commit e16edd2d5fceb6a89cadf3a23a1c7022cadc3283)

Source commit: 5c7b0e43345e691e6c19f32af744aba1100f1421

source/forms/SiteAdvanced.dfm

@@ -1069,6 +1069,7 @@ object SiteAdvancedDialog: TSiteAdvancedDialog
               'eu-west-1'
               'eu-west-2'
               'eu-west-3'
+              'me-central-1'
               'me-south-1'
               'sa-east-1'
               'us-east-1'