Fix to bugreport #905 and #893

Regarding #905:

When returning an Ajax result, inside a json string value don't use addslashes.
You don't want both " and ' escaped at the same time. Instead just use
str_replace('"','\"',$Str).

Regarding #893:

A misplaced dir and file separator ',' lead to malformed json which could result in
a non loadable subtree.

Fixes #893: webui cannot list dirs with only files in them
Fixes #905: Restore WebUI - Enable to browse directory when a file name contain a single quote

module/Restore/src/Restore/Controller/RestoreController.php

@@ -346,7 +346,7 @@ private function buildSubtree()
                --$dnum;
                $items .= '{';
                $items .= '"id":"-' . $dir['pathid'] . '"';
-               $items .= ',"text":"' . preg_replace('/[\x00-\x1F\x7F]/', '', $dir["name"]) . '"';
+               $items .= ',"text":"' . preg_replace('/[\x00-\x1F\x7F]/', '', str_replace('"', '\"', $dir["name"])) . '"';
                $items .= ',"icon":"glyphicon glyphicon-folder-close"';
                $items .= ',"state":""';
                $items .= ',"data":' . \Zend\Json\Json::encode($dir, \Zend\Json\Json::TYPE_OBJECT);
@@ -358,18 +358,18 @@ private function buildSubtree()
             }
          }
 
-      }
+         if($fnum > 0) {
+            $items .= ",";
+         }
 
-      if( $tmp > 2 && $fnum > 0 ) {
-         $items .= ",";
       }
 
       if($fnum > 0) {
 
          foreach($this->files as $file) {
             $items .= '{';
             $items .= '"id":"' . $file["fileid"] . '"';
-            $items .= ',"text":"' . preg_replace('/[\x00-\x1F\x7F]/', '', addslashes($file["name"])) . '"';
+            $items .= ',"text":"' . preg_replace('/[\x00-\x1F\x7F]/', '', str_replace('"', '\"', $file["name"])) . '"';
             $items .= ',"icon":"glyphicon glyphicon-file"';
             $items .= ',"state":""';
             $items .= ',"data":' . \Zend\Json\Json::encode($file, \Zend\Json\Json::TYPE_OBJECT);