Fix undefined variable in album widgets

The Album and Portfolio widgets would reference the undefined
$phototypes array to determine the file extensions of the image sources.

It appears that the extension is not really necessary, but for
completeness I fixed the issue so that the appropriate extension will be
used by for the image source attribute.

Zotlabs/Widget/Album.php

@@ -59,6 +59,9 @@ class Album {
 		//edit album name
 		$album_edit = null;
 
+		$ph = photo_factory('');
+		$phototypes = $ph->supportedTypes();
+
 		$photos = array();
 		if($r) {
 			$twist = 'rotright';

Zotlabs/Widget/Portfolio.php

@@ -66,6 +66,10 @@ class Portfolio {
 		//edit album name
 		$album_edit = null;
 
+
+		$ph = photo_factory('');
+		$phototypes = $ph->supportedTypes();
+
 		$photos = array();
 		if($r) {
 			$twist = 'rotright';