Check user/org repo limit instead of doer (#34147)

This PR tries to finally fix the bug mentioned in #30011 and #15504,
where the user repo limit is checked when creating a repo in an
organization.

Fix #30011

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: TheFox0x7 <thefox0x7@gmail.com>

services/repository/fork.go

@@ -65,7 +65,7 @@ func ForkRepository(ctx context.Context, doer, owner *user_model.User, opts Fork
 	}
 
 	// Fork is prohibited, if user has reached maximum limit of repositories
-	if !owner.CanForkRepo() {
+	if !doer.CanForkRepoIn(owner) {
 		return nil, repo_model.ErrReachLimitOfRepo{
 			Limit: owner.MaxRepoCreation,
 		}