Remove expired parameters in detect.py

[triple-Mu]

• Deleted the expired params after Remove unused parameters in PredictorTRT #259
• Auto expand the image size if there is only element in the img_size

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #263 (5baad2f) into main (ac6ec43) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #263   +/-   ##
=======================================
  Coverage   93.62%   93.62%           
=======================================
  Files          11       11           
  Lines         675      675           
=======================================
  Hits          632      632           
  Misses         43       43           

Flag	Coverage Δ
unittests	93.62% <ø> (ø)

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[zhiqwang]

Looks good to me, thanks @q3394101 , and welcome to yolort community!