Protocols: metadata and parallelization overrides not used

[mbercx]

Currently, the metadata and parallelization settings in the overrides supplied to the get_builder_from_protocol() method are not used (properly). In case of the metadata, these are ignored because of this line:

aiida-quantumespresso/aiida_quantumespresso/workflows/pw/base.py

Line 202 in ae410f6

builder.pw['metadata'] = inputs['metadata'] # pylint: disable=no-member

When the user provides the metadata correctly, in the pw namespace, they are not used. The defaults are still loaded because the .yaml file is incorrect.

The parallelization overrides are not used at all in the get_builder_from_protocol() method.