removed einsum causing error when use_atten_result is enabled

[oliveradk]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #659

Type of change

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• [X] Bug fix (non-breaking change which fixes an issue)

Screenshots

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Before	After

Checklist:

• [X] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [X] I have not rewritten tests relating to key interfaces which would affect backward compatibility

[oliveradk]

@bryce13950 should I close this, or should we merge the test?

[bryce13950]

Sorry @oliveradk! The last month has been pretty busy, and this one slipped through the cracks. Looks perfect, and it will be in the next release.