Remove todo comments on replacement of std::vector by std::list

Replacing std::vector by std::list wouldn't have any advantage

libgnucash/engine/mocks/gmock-Account.cpp

@@ -84,7 +84,6 @@ gnc_account_imap_find_account_bayes (
         GncImportMatchMap *imap,
         GList *tokens)
 {
-    // \todo use std::list instead of std::vector, since GList is a double-linked list like std::list
     std::vector<const char*> tokenVec;
 
     for (auto token = tokens; token; token = token->next)
@@ -101,7 +100,6 @@ gnc_account_imap_add_account_bayes (
         GList *tokens,
         Account *acc)
 {
-    // \todo use std::list instead of std::vector, since GList is a double-linked list like std::list
     std::vector<const char*> tokenVec;
 
     for (auto token = tokens; token; token = token->next)