erp5_interface_post: do not pass potentially huge data as acitvity parameters

As we may reach database limits, and to avoid them to be logged.

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/InternetMessagePost_export.py

@@ -5,4 +5,4 @@ context.activate(
   activity='SQLQueue',
   conflict_retry=False,
   max_retry=0,
-).ERP5Site_sendMailHostMessage(context.getData())
+).InternetMessagePost_sendMailHostMessage()

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/ERP5Site_sendMailHostMessage.py → bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/InternetMessagePost_sendMailHostMessage.py

@@ -6,4 +6,4 @@
 #     conflict_retry=False,
 #     max_retry=0,
 
-context.getPortalObject().MailHost.send(data)
+context.getPortalObject().MailHost.send(context.getData())

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/ERP5Site_sendMailHostMessage.xml → bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/InternetMessagePost_sendMailHostMessage.xml

@@ -50,11 +50,11 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>data</string> </value>
+            <value> <string></string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>
-            <value> <string>ERP5Site_sendMailHostMessage</string> </value>
+            <value> <string>InternetMessagePost_sendMailHostMessage</string> </value>
         </item>
       </dictionary>
     </pickle>