Add status destroy authorization to policy (#3453)

* Add status destroy authorization to policy

* Create explicit unreblog status authorization

app/controllers/api/v1/statuses_controller.rb

@@ -79,7 +79,10 @@ class Api::V1::StatusesController < ApiController
 
   def destroy
     @status = Status.where(account_id: current_user.account).find(params[:id])
+    authorize @status, :destroy?
+
     RemovalWorker.perform_async(@status.id)
+
     render_empty
   end
 
@@ -93,6 +96,8 @@ class Api::V1::StatusesController < ApiController
     @status      = reblog.reblog
     @reblogs_map = { @status.id => false }
 
+    authorize reblog, :unreblog?
+
     RemovalWorker.perform_async(reblog.id)
 
     render :show