CiviReport Export: fix bug when reports have a comma in their title

Mostly seen in Chrome-based browsers (not Firefox) on Windows.
If a report has a comma in the title, then the browser does not
recognize the file type.

Civi/Report/Civiexportexcel/Excel2007.php

@@ -72,7 +72,7 @@ class Excel2007 extends OutputHandlerBase implements OutputHandlerInterface {
    */
   public function download() {
     \CRM_Utils_System::setHttpHeader('Content-Type', $this->getMimeType());
-    \CRM_Utils_System::setHttpHeader('Content-Disposition', 'attachment; filename=' . $this->getFileName());
+    \CRM_Utils_System::setHttpHeader('Content-Disposition', 'attachment; filename="' . $this->getFileName() . '"');
     \CRM_Utils_System::setHttpHeader('Content-Description', $this->getFileName());
     \CRM_Utils_System::setHttpHeader('Content-Transfer-Encoding', 'binary');
     // Being over-zealous to make sure that the file is not cached