fixed permute_counts method and fixed dicke_wavefunction docstring

[vishal-ph]

Description

• Fixed the definition of permute_counts_dictionary function in utilities.py
• Fixed the docstring incorrect type-hinting in dicke_wavefunction in utilities.py

Checklist

• [x] I have performed a self-review of my code.
• [x] I have commented my code and used numpy-style docstrings
• [x] I have made corresponding updates to the documentation.
• [x] My changes generate no new warnings
• [x] I have added/updated tests to make sure bugfix/feature works.
• [x] New and existing unit tests pass locally with my changes.

Type of change

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

How Has This Been Tested?

Added a new unit-test to test_utilities.py

[codecov[bot]]

Codecov Report

Merging #215 (6140672) into dev (3278e64) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #215   +/-   ##
=======================================
  Coverage   97.72%   97.72%           
=======================================
  Files          37       37           
  Lines        6771     6776    +5     
=======================================
+ Hits         6617     6622    +5     
  Misses        154      154           

Impacted Files	Coverage Δ
tests/test_utilities.py	99.43% <100.00%> (+<0.01%)	:arrow_up:

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