fix: ".return" is not a function of "db.del"

[nvanheuverzwijn]

Whenever the token expiration code run, this error pops up.

{"error":"server_error","error_description":"this.remove(...).return is not a function"}

[codecov[bot]]

Codecov Report

Merging #930 into master will increase coverage by 0.05%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #930      +/-   ##
==========================================
+ Coverage   88.91%   88.96%   +0.05%     
==========================================
  Files         137      137              
  Lines        3734     3735       +1     
==========================================
+ Hits         3320     3323       +3     
+ Misses        414      412       -2

Impacted Files	Coverage Δ
...ices/authorization-codes/authorization-code.dao.js	95.45% <100%> (+4.97%)	:arrow_up:
lib/policies/oauth2/oauth2-server.js	94.79% <0%> (+1.04%)	:arrow_up:

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[XVincentX]

Thanks @nvanheuverzwijn. It's really this part isn't properly tested; would you be open to add a minimal test for this functionality as well?

[nvanheuverzwijn]

@XVincentX Just added a test. Tell me if this is what you have in mind.

[XVincentX]

Thanks for this fix, I'll release a version now :)