Fix mistake in total steps computation for GLUE notebook

[Valahaar]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #133 (issue).

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

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[codecov]

Codecov Report

Merging #142 (f85f9f5) into main (226bb97) will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff         @@
##           main   #142   +/-   ##
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  Coverage    75%    75%           
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  Files         2      2           
  Lines       353    353           
===================================
  Hits        265    265           
  Misses       88     88