financial#50 - Fix contributions getting overwritten

This fixes an issue where contributions may be overwritten when users
open an existing contribution after opening the "Record Contribution"
form (but before actually submitting it).

CRM/Contribute/Form/Contribution.php

@@ -250,7 +250,7 @@ class CRM_Contribute_Form_Contribution extends CRM_Contribute_Form_AbstractEditP
     $this->assign('action', $this->_action);
 
     // Get the contribution id if update
-    $this->_id = CRM_Utils_Request::retrieve('id', 'Positive', $this);
+    $this->_id = CRM_Utils_Request::retrieve('id', 'Positive');
     if (!empty($this->_id)) {
       $this->assignPaymentInfoBlock();
       $this->assign('contribID', $this->_id);