Bugfix for checking durable functions implicit output

[gavin-aguiar]

Description

Fixed typo for setting implicit output binding

Fixes #

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PR information

• [ ] The title of the PR is clear and informative.
• [ ] There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• [ ] If applicable, the PR references the bug/issue that it fixes in the description.
• [ ] New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

• [ ] I have read the contribution guidelines.

[codecov[bot]]

Codecov Report

Merging #1099 (98750b6) into dev (bcdb5cf) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 98750b6 differs from pull request most recent head 635106e. Consider uploading reports for the commit 635106e to get more accurate results

@@           Coverage Diff           @@
##              dev    #1099   +/-   ##
=======================================
  Coverage   83.88%   83.88%           
=======================================
  Files          34       34           
  Lines        1868     1868           
  Branches      300      300           
=======================================
  Hits         1567     1567           
  Misses        235      235           
  Partials       66       66           

Flag	Coverage Δ
unittests	83.88% <ø> (ø)

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

Impacted Files	Coverage Δ
azure_functions_worker/functions.py	96.21% <ø> (ø)

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