fix tests

Author: lunny

models/fixtures/issue.yml

@@ -90,7 +90,7 @@
   id: 8
   repo_id: 10
   index: 1
-  poster_id: 1
+  poster_id: 11
   name: pr2
   content: a pull request
   is_closed: false

models/fixtures/pull_request.yml

@@ -32,7 +32,7 @@
   type: 0 # gitea pull request
   status: 2 # mergable
   issue_id: 8
-  index: 4
+  index: 1
   head_repo_id: 11
   base_repo_id: 10
   head_user_name: user13