Avoid double nesting in ProcessingModule html repr

[h-mayorquin]

Moved here from hdmf-dev/hdmf#1354 at the request of @rly

Checklist

• Did you update CHANGELOG.md with your changes?
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.14%. Comparing base (7e100c2) to head (f84078f).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2149      +/-   ##
==========================================
- Coverage   95.23%   95.14%   -0.10%     
==========================================
  Files          29       29              
  Lines        2876     2884       +8     
  Branches      740      742       +2     
==========================================
+ Hits         2739     2744       +5     
- Misses         83       85       +2     
- Partials       54       55       +1     

Flag	Coverage Δ
integration	74.27% <12.50%> (-0.18%)	⬇️
unit	84.88% <100.00%> (-0.07%)	⬇️

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[rly]

Could you remove the ".data_interfaces" in the tooltip/hover?