Fixed double softmax bug in SSLEvaluator

[norabelrose]

What does this PR do?

Fixes #662

[codecov]

Codecov Report

Merging #663 (cb83c2e) into master (b087892) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #663   +/-   ##
=======================================
  Coverage   25.54%   25.54%           
=======================================
  Files         118      118           
  Lines        7110     7110           
=======================================
  Hits         1816     1816           
  Misses       5294     5294           

Flag	Coverage Δ
cpu	25.54% <0.00%> (ø)
pytest	25.54% <0.00%> (ø)

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Impacted Files	Coverage Δ
pl_bolts/callbacks/ssl_online.py	25.00% <0.00%> (ø)
pl_bolts/models/self_supervised/evaluator.py	38.88% <0.00%> (ø)
pl_bolts/models/self_supervised/ssl_finetuner.py	24.13% <0.00%> (ø)

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[ethanwharris]

LGTM 😃

[awaelchli]

LGTM
ignore my previous comment

[Borda]

LGTM
ignore my previous comment

I do not see any :P