Bugfix for cliff-lorimer quantification

[thomasaarholt]

Description of the change

• There would be an an error on quantifying a single array of intensities due to a typo
• Several if absorption_correction is not None led to absorption_correction = absorption_correction, which was unnecessary.
  I'm afraid that I don't have time to add tests.

Progress of the PR

• Change implemented (can be split into several points),
• ready for review.

[codecov]

Codecov Report

Merging #2822 (717e41b) into RELEASE_next_minor (836e7df) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@                  Coverage Diff                   @@
##           RELEASE_next_minor    #2822      +/-   ##
======================================================
+ Coverage               80.08%   80.12%   +0.03%     
======================================================
  Files                     209      209              
  Lines                   32581    32574       -7     
  Branches                 7335     7333       -2     
======================================================
+ Hits                    26094    26099       +5     
+ Misses                   4736     4725      -11     
+ Partials                 1751     1750       -1     

Impacted Files	Coverage Δ
hyperspy/_signals/eds_tem.py	83.73% <100.00%> (+0.22%)	⬆️
hyperspy/misc/eds/utils.py	92.55% <100.00%> (+4.94%)	⬆️
hyperspy/io_plugins/jeol.py	85.23% <0.00%> (ø)

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[ericpre]

Thanks @thomasaarholt, but as you would have anticipated, this would a test! If you don't have time, then someone else should finish the PR.
From the coverage, it seems that the missing case is: CL quantification of a single spectrum with absorption_correction=None.

[jlaehne]

Does anyone have time to add tests? Should be low hanging fruits.

[jlaehne]

add changelog entry?