Fix test test_output_mode_dict

[AryazE]

There was a problem with checking the backend (the () were forgotten), and hence the condition always evaluated to False.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.37%. Comparing base (cb6ece3) to head (7069740).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20228      +/-   ##
==========================================
- Coverage   82.12%   79.37%   -2.75%     
==========================================
  Files         501      501              
  Lines       47440    47440              
  Branches     8711     8711              
==========================================
- Hits        38958    37655    -1303     
- Misses       6570     8022    +1452     
+ Partials     1912     1763     -149     

Flag	Coverage Δ
keras	79.22% <ø> (-2.76%)	⬇️
keras-jax	62.51% <ø> (-2.76%)	⬇️
keras-numpy	57.70% <ø> (-0.15%)	⬇️
keras-tensorflow	63.89% <ø> (-2.76%)	⬇️
keras-torch	62.56% <ø> (-2.75%)	⬇️
keras.applications	?
keras.applications-jax	?
keras.applications-numpy	?
keras.applications-tensorflow	?
keras.applications-torch	?

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[fchollet]

Thanks for the fix!