changed default value of final_conv_length to 'auto' in Deep4Net

[sliwy]

After last changes, default value of final_conv_length in Deep4Net is None and code fails. Before it was mandatory to provide this paramter. I'm setting default to `"auto" -> it should not break earlier code as before it had to be specified.

[codecov[bot]]

Codecov Report

Merging #535 (1c4376a) into master (ae843fe) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #535   +/-   ##
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  Coverage   84.48%   84.48%           
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  Files          63       63           
  Lines        4653     4653           
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  Hits         3931     3931           
  Misses        722      722           

[robintibor]

good catch! and what about shallow? should be same Problem there no?

[sliwy]

for shallow filter_time_length is set to 25 by default, it was the same before recent changes and it still works as before :)

[bruAristimunha]

Thank you @sliwy =)