Change internal streaming payloads to stringified IDs as well

Per
https://github.com/tootsuite/mastodon/pull/5019#issuecomment-330736452
we need these changes to send deleted status IDs as strings, not
integers.

app/services/batched_remove_status_service.rb

@@ -18,7 +18,7 @@ class BatchedRemoveStatusService < BaseService
     @stream_entry_batches  = []
     @salmon_batches        = []
     @activity_json_batches = []
-    @json_payloads         = statuses.map { |s| [s.id, Oj.dump(event: :delete, payload: s.id)] }.to_h
+    @json_payloads         = statuses.map { |s| [s.id, Oj.dump(event: :delete, payload: s.id.to_s)] }.to_h
     @activity_json         = {}
     @activity_xml          = {}
 

app/services/remove_status_service.rb

@@ -4,7 +4,7 @@ class RemoveStatusService < BaseService
   include StreamEntryRenderer
 
   def call(status)
-    @payload      = Oj.dump(event: :delete, payload: status.id)
+    @payload      = Oj.dump(event: :delete, payload: status.id.to_s)
     @status       = status
     @account      = status.account
     @tags         = status.tags.pluck(:name).to_a