Customize: Prevent using default template for a base control when it has content rendered on the server.

Also prevent invalid `type` attribute from being added to a `select` element.

See #30738.
Fixes #42286.


git-svn-id: https://develop.svn.wordpress.org/trunk@41952 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-customize-manager.php

@@ -4019,6 +4019,7 @@ final class WP_Customize_Manager {
 							<# }); #>
 						>{{ inputAttrs.value }}</textarea>
 					<# } else if ( 'select' === data.type ) { #>
+						<# delete inputAttrs.type; #>
 						<select
 							<# _.each( _.extend( inputAttrs ), function( value, key ) { #>
 								{{{ key }}}="{{ value }}"