obsolete: fix ValueError when stored note contains ':' char (
issue5783)
The newer version of `amend -n 'Some some'` accepts containing ':' char.
The information contained in this note 'Testing::Obstore' gives ValueError,
because we are trying to store more than 2 values in key and value.
Differential Revision: https://phab.mercurial-scm.org/D4883
Differential Revision: https://phab.mercurial-scm.org/D4882
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