moved circuit params to local model state

[stroblme]

No description provided.

[pep8speaks]

Hello @stroblme! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file qml_essentials/model.py:

Line 149:80: E501 line too long (95 > 79 characters)
Line 177:80: E501 line too long (83 > 79 characters)
Line 185:80: E501 line too long (82 > 79 characters)

[stroblme]

ignoring pep, formatting addressed in #3