[BugFix] Create Repository Respect AlternateDefaultBranch

[6543]

close #12359

[codecov-commenter]

Codecov Report

Merging #12746 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #12746      +/-   ##
==========================================
- Coverage   43.42%   43.41%   -0.01%     
==========================================
  Files         648      648              
  Lines       71581    71583       +2     
==========================================
- Hits        31081    31076       -5     
- Misses      35470    35475       +5     
- Partials     5030     5032       +2     

Impacted Files	Coverage Δ
modules/avatar/avatar.go	50.00% <100.00%> (ø)
modules/repository/create.go	63.41% <100.00%> (+1.87%)	⬆️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
models/repo_mirror.go	2.38% <0.00%> (-11.91%)	⬇️
modules/cron/tasks_basic.go	87.35% <0.00%> (-3.45%)	⬇️
services/pull/check.go	47.69% <0.00%> (-2.31%)	⬇️
modules/queue/unique_queue_disk_channel.go	53.84% <0.00%> (-1.54%)	⬇️
services/mirror/mirror.go	18.58% <0.00%> (-1.36%)	⬇️
models/error.go	34.81% <0.00%> (-0.52%)	⬇️
models/issue_comment.go	53.75% <0.00%> (-0.16%)	⬇️
... and 5 more

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