BF: Keyring.delete called uninitialized attribute

[bpoldrack]

Likely a typo, delete() called an uninitialized private attribute instead
of the lazy loading, protected one.

Note, that this particular bug was only recently introduced to master, so "patch" but against master.

Introduced by: 3cddd7c

[mih]

If you know what introduced it, please record it here.

[bpoldrack]

If you know what introduced it, please record it here.

Updated description.

[codecov]

Codecov Report

Merging #6253 (446cd7a) into master (a9f423a) will decrease coverage by 2.41%.
The diff coverage is 100.00%.

❗ Current head 446cd7a differs from pull request most recent head 3734042. Consider uploading reports for the commit 3734042 to get more accurate results

@@            Coverage Diff             @@
##           master    #6253      +/-   ##
==========================================
- Coverage   89.62%   87.21%   -2.42%     
==========================================
  Files         323      323              
  Lines       41979    41976       -3     
==========================================
- Hits        37624    36608    -1016     
- Misses       4355     5368    +1013     

Impacted Files	Coverage Δ
datalad/support/keyring_.py	90.32% <100.00%> (-4.84%)	⬇️
datalad/version.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/plugin/wtf.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/plugin/addurls.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/interface/clean.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/interface/rerun.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/plugin/no_annex.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/interface/unlock.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/distribution/drop.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/plugin/add_readme.py	0.00% <0.00%> (-100.00%)	⬇️
... and 111 more

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[mih]

Thx!