Fixing image insertion in tables

[Lucas-C]

Fixes some remaining bugs following PR #768

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (851eaa3) 93.21% compared to head (fffef92) 93.22%.

❗ Current head fffef92 differs from pull request most recent head 247a217. Consider uploading reports for the commit 247a217 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #773      +/-   ##
==========================================
+ Coverage   93.21%   93.22%   +0.01%     
==========================================
  Files          27       27              
  Lines        7308     7311       +3     
  Branches     1323     1322       -1     
==========================================
+ Hits         6812     6816       +4     
  Misses        309      309              
+ Partials      187      186       -1     

Impacted Files	Coverage Δ
fpdf/fpdf.py	92.38% <100.00%> (+0.06%)	⬆️
fpdf/table.py	92.27% <100.00%> (+0.03%)	⬆️

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