Fix list_options GetStartEnd

[sebastian-sauer]

end is start + pageSize and not start + page

as mentioned in #16300

[codecov-commenter]

Codecov Report

Merging #16303 (76c66df) into main (add74fb) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main   #16303      +/-   ##
==========================================
+ Coverage   45.40%   45.41%   +0.01%     
==========================================
  Files         709      709              
  Lines       83500    83500              
==========================================
+ Hits        37912    37921       +9     
+ Misses      39497    39496       -1     
+ Partials     6091     6083       -8     

Impacted Files	Coverage Δ
models/list_options.go	43.47% <0.00%> (ø)
services/mailer/mail_comment.go	77.77% <0.00%> (-7.41%)	⬇️
modules/avatar/avatar.go	47.72% <0.00%> (-4.55%)	⬇️
modules/log/event.go	58.96% <0.00%> (-0.95%)	⬇️
models/error.go	39.68% <0.00%> (+0.77%)	⬆️
models/notification.go	65.85% <0.00%> (+0.88%)	⬆️
modules/notification/mail/mail.go	36.27% <0.00%> (+0.98%)	⬆️
modules/notification/ui/ui.go	62.31% <0.00%> (+1.44%)	⬆️
services/pull/check.go	28.27% <0.00%> (+2.06%)	⬆️

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[6543]

-> #16305