Fixing wrong paging when filtering on the issue dashboard (#19801)
Fixing wrong paging when filtering on the issue dashboard (#19801)

Fixes #19791 by adding an check if filtering after any repo; if yes, simply set the total count for the pageing to the sum of the issue count for each selected repo by utilize `issueCountByRepo`.

Fix #19791 
go-gitea/gitea,go-gitea/gitea,go-gitea/gitea