Fix message when deleting last owner from an organization

[zeripath]

Signed-off-by: Andrew Thornton art27@cantab.net

[codecov-commenter]

Codecov Report

Merging #12628 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12628      +/-   ##
==========================================
- Coverage   43.44%   43.42%   -0.02%     
==========================================
  Files         645      645              
  Lines       71328    71328              
==========================================
- Hits        30986    30977       -9     
- Misses      35331    35336       +5     
- Partials     5011     5015       +4     

Impacted Files	Coverage Δ
modules/indexer/stats/db.go	52.17% <0.00%> (-8.70%)	⬇️
modules/git/utils.go	73.77% <0.00%> (-3.28%)	⬇️
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
modules/git/repo.go	49.23% <0.00%> (-0.51%)	⬇️
services/pull/pull.go	41.57% <0.00%> (-0.47%)	⬇️

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