Permissions: Fix missing initialization with 0 in some cases

permissions.h

@@ -17,7 +17,7 @@
 class Permissions
 {
   private:
-	int permissions;
+	int permissions = 0;
 	const std::map<std::string, int> permmap = {{"can_read", PERM_CAN_READ},
 												{"can_edit", PERM_CAN_EDIT},
 												{"can_page_history", PERM_CAN_PAGE_HISTORY},