fix both failing RoCBert tests
# What does this PR do?
Fixes two failing test : 
- tokenization test did not take into account that the dummy tokenizer's `pad_token_id = 2` and `bos_token_id = 1`. The values used were `102, 101`. 
- on of the modeling test used `assertEqual` on tensors and not list, which is ambigus. 
 
The two tests no pass locally (which was not the case before) <|||||>_The documentation is not available anymore as the PR was closed or merged._