Reduce priority of _repr_<img>_

[philippjfr]

Fixes #5168

[codecov]

Codecov Report

Merging #5217 (2a4ccdf) into main (ce41892) will increase coverage by 9.85%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #5217      +/-   ##
==========================================
+ Coverage   73.78%   83.64%   +9.85%     
==========================================
  Files         274      274              
  Lines       39594    39594              
==========================================
+ Hits        29214    33117    +3903     
+ Misses      10380     6477    -3903     

Flag	Coverage Δ
ui-tests	39.51% <0.00%> (?)
unitexamples-tests	73.78% <0.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
panel/pane/image.py	87.40% <0.00%> (ø)

... and 56 files with indirect coverage changes

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