Update consts.py

[marijanbeg]

Fix muB

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (1163e81) 99.82% compared to head (3c4ed6e) 99.82%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #79 +/- ## ======================================= Coverage 99.82% 99.82% ======================================= Files 30 30 Lines 559 559 ======================================= Hits 558 558 Misses 1 1 ``` | [Files](https://app.codecov.io/gh/ubermag/micromagneticmodel/pull/79?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ubermag) | Coverage Δ | | |---|---|---| | [micromagneticmodel/consts.py](https://app.codecov.io/gh/ubermag/micromagneticmodel/pull/79?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ubermag#diff-bWljcm9tYWduZXRpY21vZGVsL2NvbnN0cy5weQ==) | `100.00% <100.00%> (ø)` | |

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