Ensure responsive DynamicMap is not centered

[philippjfr]

No description provided.

[codecov-io]

Codecov Report

Merging #789 into master will increase coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #789      +/-   ##
==========================================
+ Coverage   69.23%   69.32%   +0.09%     
==========================================
  Files         103      103              
  Lines       10352    10355       +3     
==========================================
+ Hits         7167     7179      +12     
+ Misses       3185     3176       -9

Impacted Files	Coverage Δ
panel/pane/holoviews.py	76.47% <100%> (+0.19%)	⬆️
panel/util.py	66.08% <0%> (+1.73%)	⬆️
panel/tests/pane/test_image.py	100% <0%> (+14.89%)	⬆️

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