Updates for latest change in xrayvision

[samaloney]

• Remove no unnesary transpose from EM algorithm (due to fix in xrayvison)
• Update imaging demo
  • Units for pixel are now arcsec/pixel
  • Flare location in array indexing (v WCS) is [stix_max.Ty, six_max.Tx]

Only to be merged after TCDSolar/xrayvision/pull/58

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 72.57%. Comparing base (8867c2d) to head (3ad179f).
Report is 9 commits behind head on main.

Files	Patch %	Lines
stixpy/imaging/em.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   72.53%   72.57%   +0.03%     
==========================================
  Files          31       31              
  Lines        1857     1856       -1     
==========================================
  Hits         1347     1347              
+ Misses        510      509       -1     

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