remove densenet161 duplicate in DENSENET_MODELS

[mabu-dev]

What does this PR do?

In DENSENET_MODELS densenet161 is duplicated, this removes the duplicate.

Fixes # (issue)
Removes a duplicate entry of densenet161 In DENSENET_MODELS.

PR review

• Yes.

[codecov]

Codecov Report

Merging #76 (33e6873) into master (cffcbd9) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #76   +/-   ##
=======================================
  Coverage   86.61%   86.61%           
=======================================
  Files          45       45           
  Lines        1367     1367           
=======================================
  Hits         1184     1184           
  Misses        183      183           

Flag	Coverage Δ
unittests	86.61% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/vision/backbones.py	90.90% <100.00%> (ø)

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