Fix data type mismatch error with custom field filter

Disable strict type checking on check_selected() calls in
print_filter_custom_field() as there is no way to cover all possible
test cases by typecasting the parameters.

Fixes #19916

core/filter_api.php

@@ -4129,13 +4129,13 @@ function print_filter_custom_field( $p_field_id ) {
 		} else {
 			echo '<select' . $g_select_modifier . ' name="custom_field_' . $p_field_id . '[]">';
 			echo '<option value="' . META_FILTER_ANY . '"';
-			check_selected( $g_filter['custom_fields'][$p_field_id], (string)META_FILTER_ANY );
+			check_selected( $g_filter['custom_fields'][$p_field_id], META_FILTER_ANY, false );
 			echo '>[' . lang_get( 'any' ) . ']</option>';
 
 			# don't show META_FILTER_NONE for enumerated types as it's not possible for them to be blank
 			if( !in_array( $t_accessible_custom_fields_types[$j], array( CUSTOM_FIELD_TYPE_ENUM, CUSTOM_FIELD_TYPE_LIST, CUSTOM_FIELD_TYPE_MULTILIST ) ) ) {
 				echo '<option value="' . META_FILTER_NONE . '"';
-				check_selected( $g_filter['custom_fields'][$p_field_id], (string)META_FILTER_NONE );
+				check_selected( $g_filter['custom_fields'][$p_field_id], META_FILTER_NONE, false );
 				echo '>[' . lang_get( 'none' ) . ']</option>';
 			}
 			if( is_array( $t_accessible_custom_fields_values[$j] ) ) {
@@ -4144,7 +4144,7 @@ function print_filter_custom_field( $p_field_id ) {
 					if( ( strtolower( $t_item ) !== META_FILTER_ANY ) && ( strtolower( $t_item ) !== META_FILTER_NONE ) ) {
 						echo '<option value="' . string_attribute( $t_item ) . '"';
 						if( isset( $g_filter['custom_fields'][$p_field_id] ) ) {
-							check_selected( $g_filter['custom_fields'][$p_field_id], $t_item );
+							check_selected( $g_filter['custom_fields'][$p_field_id], $t_item, false );
 						}
 						echo '>' . string_attribute( string_shorten( $t_item, $t_max_length ) ) . '</option>' . "\n";
 					}