Fix JSHint errors in EventSource class
Fix JSHint errors in EventSource class

michaelletzgus/nextcloud-server,sharidas/core,bluelml/core,xx621998xx/server,bluelml/core,cernbox/core,endsguy/server,pmattern/server,nextcloud/server,pixelipo/server,pixelipo/server,xx621998xx/server,pollopolea/core,sharidas/core,IljaN/core,pixelipo/server,sharidas/core,IljaN/core,pmattern/server,whitekiba/server,jbicha/server,andreas-p/nextcloud-server,nextcloud/server,Ardinis/server,Ardinis/server,xx621998xx/server,owncloud/core,jbicha/server,IljaN/core,lrytz/core,endsguy/server,owncloud/core,xx621998xx/server,owncloud/core,lrytz/core,bluelml/core,whitekiba/server,endsguy/server,pollopolea/core,andreas-p/nextcloud-server,cernbox/core,pmattern/server,michaelletzgus/nextcloud-server,Ardinis/server,endsguy/server,lrytz/core,IljaN/core,bluelml/core,pmattern/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,sharidas/core,whitekiba/server,whitekiba/server,cernbox/core,pmattern/server,bluelml/core,owncloud/core,cernbox/core,jbicha/server,jbicha/server,pixelipo/server,pixelipo/server,sharidas/core,phil-davis/core,pollopolea/core,endsguy/server,cernbox/core,owncloud/core,xx621998xx/server,pollopolea/core,lrytz/core,nextcloud/server,michaelletzgus/nextcloud-server,IljaN/core,nextcloud/server,whitekiba/server,Ardinis/server,lrytz/core,michaelletzgus/nextcloud-server,Ardinis/server,andreas-p/nextcloud-server,pollopolea/core,jbicha/server