Multiple assignees (#3705)

models/fixtures/issue_user.yml

@@ -3,7 +3,6 @@
   uid: 1
   issue_id: 1
   is_read: true
-  is_assigned: true
   is_mentioned: false
 
 -
@@ -11,7 +10,6 @@
   uid: 2
   issue_id: 1
   is_read: true
-  is_assigned: false
   is_mentioned: false
 
 -
@@ -19,5 +17,4 @@
   uid: 4
   issue_id: 1
   is_read: false
-  is_assigned: false
   is_mentioned: false