Disable migration items when mirror is selected

[mrsdizzie]

Disable migration items except wiki when mirror option is selected to make it more clear that it isn't possible to mirror anything other than code.

[techknowlogick]

LGTM. Perhaps a note that issues etc can’t be selected if mirror used?

[lunny]

But wiki could be selected?

[mrsdizzie]

@lunny hmm good point! Didn't know that

[codecov-commenter]

Codecov Report

Merging #12918 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #12918   +/-   ##
=======================================
  Coverage   43.08%   43.08%           
=======================================
  Files         658      658           
  Lines       72454    72454           
=======================================
+ Hits        31215    31216    +1     
- Misses      36182    36184    +2     
+ Partials     5057     5054    -3     

Impacted Files	Coverage Δ
modules/log/event.go	57.54% <0.00%> (-1.89%)	⬇️
modules/queue/workerpool.go	58.77% <0.00%> (-1.23%)	⬇️
models/error.go	34.81% <0.00%> (-0.52%)	⬇️
models/issue_comment.go	53.75% <0.00%> (-0.16%)	⬇️
routers/repo/view.go	38.11% <0.00%> (+0.64%)	⬆️
services/pull/check.go	47.69% <0.00%> (+0.76%)	⬆️
modules/process/manager.go	75.00% <0.00%> (+2.50%)	⬆️
modules/indexer/stats/queue.go	76.47% <0.00%> (+11.76%)	⬆️
modules/indexer/stats/db.go	60.86% <0.00%> (+17.39%)	⬆️

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[mrsdizzie]

@lunny fixed now it lets you keep wiki : )