Fix folder drag glitch in Firefox
Fix folder drag glitch in Firefox

issue:
* drag'n'drop a folder into the files app in Firefox
* the highlight stays there because Firefox doesn't trigger the drop event for folders

solution:
* behave like the drop event if the dragover event isn't fired for 100ms (only applied in Firefox)

jbicha/server,pmattern/server,jbicha/server,andreas-p/nextcloud-server,endsguy/server,endsguy/server,whitekiba/server,endsguy/server,Ardinis/server,xx621998xx/server,whitekiba/server,andreas-p/nextcloud-server,Ardinis/server,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,pmattern/server,andreas-p/nextcloud-server,pixelipo/server,xx621998xx/server,jbicha/server,andreas-p/nextcloud-server,Ardinis/server,andreas-p/nextcloud-server,pmattern/server,pmattern/server,Ardinis/server,jbicha/server,pixelipo/server,Ardinis/server,whitekiba/server,michaelletzgus/nextcloud-server,endsguy/server,pixelipo/server,nextcloud/server,pixelipo/server,jbicha/server,pmattern/server,michaelletzgus/nextcloud-server,xx621998xx/server,xx621998xx/server,xx621998xx/server,nextcloud/server,endsguy/server,whitekiba/server,nextcloud/server,pixelipo/server,nextcloud/server,whitekiba/server