[GeoDirectory] Fix database error "WordPress database error Column 'post_category' in field list is ambiguous for query"

GeoDirectory-export-fix-ambiguous_post_category.php

/**
 * CSV Export: Fix database error "WordPress database error Column 'post_category' in field list is ambiguous for query".
 */
function gd_snippet_20190827_imex_export_posts_query( $query, $post_type ) {
	$table = geodir_db_cpt_table( $post_type );

	$query = str_replace( ",post_category", ",{$table}.post_category", $query );
	$query = str_replace( ",`post_category`", ",`{$table}`.`post_category`", $query );

	return $query;
}
add_filter( 'geodir_imex_export_posts_query', 'gd_snippet_20190827_imex_export_posts_query', 20, 2 );