Fixes a bug rendering graphs with special characters in the rrd file names. This is evident in the 'Rx Queue#' and 'Tx Queue#' graphs for the ethstats plugin of collectd. These RRD files have a '#' character in the name which is not url encoded and causes drawing the graphs to fail.
url encode graph names
Auto-Deploy finished, Test PR at http://1350.ci.librenms.org or https://1350.ci.librenms.org