fix label of --id in admin delete user

[zeripath]

This pr fixes the label descriptor of gitea admin delete user
but also adds a --username and --email option.

Fix #13995

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

[codecov-io]

Codecov Report

Merging #14005 (8156065) into master (9e456b5) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #14005      +/-   ##
==========================================
+ Coverage   42.20%   42.22%   +0.01%     
==========================================
  Files         710      710              
  Lines       77295    77306      +11     
==========================================
+ Hits        32626    32645      +19     
- Misses      39290    39294       +4     
+ Partials     5379     5367      -12     

Impacted Files	Coverage Δ
cmd/admin.go	0.00% <0.00%> (ø)
modules/log/event.go	59.90% <0.00%> (-1.89%)	⬇️
services/mailer/mail.go	60.21% <0.00%> (-1.08%)	⬇️
modules/notification/mail/mail.go	39.08% <0.00%> (ø)
models/issue_comment.go	52.71% <0.00%> (+0.45%)	⬆️
routers/repo/view.go	38.11% <0.00%> (+0.64%)	⬆️
models/error.go	39.31% <0.00%> (+0.81%)	⬆️
models/notification.go	67.24% <0.00%> (+0.98%)	⬆️
services/pull/check.go	51.09% <0.00%> (+1.45%)	⬆️
models/unit.go	49.31% <0.00%> (+2.73%)	⬆️
... and 2 more

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[techknowlogick]

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