fix(mapping): fix dynamic mapping in content api
fix(mapping): fix dynamic mapping in content api

same fix there is for items resource in superdesk

ioanpocol/superdesk-core,mugurrus/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,marwoodandrew/superdesk-core,superdesk/superdesk-core,mdhaman/superdesk-core,superdesk/superdesk-core,nistormihai/superdesk-core,hlmnrmr/superdesk-core,marwoodandrew/superdesk-core,petrjasek/superdesk-core,mdhaman/superdesk-core,hlmnrmr/superdesk-core,ioanpocol/superdesk-core,mugurrus/superdesk-core,mdhaman/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,mugurrus/superdesk-core,ioanpocol/superdesk-core,nistormihai/superdesk-core,petrjasek/superdesk-core