Remove unnecessary select for removing an auth code grant

[q0w]

Description of the Change

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[dopry]

What's the upside to this change?

[q0w]

-1 SQL query. Instead of fetching first and then deleting, you can just delete. .delete() returns the number of deleted rows, so you can still raise an error if nothing was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.01%. Comparing base (e34819a) to head (e488f89).
Report is 46 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1568      +/-   ##
==========================================
- Coverage   97.41%   97.01%   -0.40%     
==========================================
  Files          34       34              
  Lines        2164     2212      +48     
==========================================
+ Hits         2108     2146      +38     
- Misses         56       66      +10     

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[dopry]

@n2ygk this looks good to me. Do you have any reservations about merging?

[n2ygk]

@n2ygk this looks good to me. Do you have any reservations about merging?

@dopry I'd like to see the checklist completed (author name in AUTHORS, etc.). Also needs to be rebased. Otherwise I'm good with you merging it.

[q0w]

unit-test added

There is an already existing test for that

documentation updated

Not needed

CHANGELOG.md updated (only for user relevant changes)

Not needed