fix aspect ratio displaying

inc/display.php

@@ -348,6 +348,10 @@ class Post {
 		return $built;
 	}
 	
+	public function ratio() {
+		return fraction($this->filewidth, $this->fileheight, ':');
+	}
+	
 	public function build($index=false) {
 		global $board, $config;
 		
@@ -464,6 +468,10 @@ class Thread {
 		return $built;
 	}
 	
+	public function ratio() {
+		return fraction($this->filewidth, $this->fileheight, ':');
+	}
+	
 	public function build($index=false) {
 		global $board, $config, $debug;