Fix complete access for canopen

[julieta-prieto]

Description

Canopen registers can be read using complete access right now.
However, the arguments that were used for __read_raw() method were incorrect, leading to exceptions:

Type of change

Please add a description and delete options that are not relevant.

• Fixed read_complete_access read arguments for canopen registers.
• Updated DriveContextManager to just read registers using complete access for EtherCAT servos.

Tests

• Add new unit tests if it applies.

Please describe the manual tests that you ran to verify your changes if it applies.

Documentation

Please update the documentation.

• Update docstrings of every function, method or class that change.
• Build documentation locally to verify changes.
• Add the changes at the [Unreleased] section of the CHANGELOG.