account for customizable extra network separators in remove code

onUiLoaded(setupExtraNetworks);

var re_extranet = /<([^:]+:[^:]+):[\d.]+>(.*)/;

var re_extranet_g = /\s+<([^:]+:[^:]+):[\d.]+>/g;

var re_extranet_str = '<([^:]+:[^:]+):[\\d.]+>';

function tryToRemoveExtraNetworkFromPrompt(textarea, text) {

    function reEscape(s) {

        return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");

    }

    var m = text.match(re_extranet);

    var replaced = false;

    var newTextareaText;

        var extraTextAfterNet = m[2];

        var partToSearch = m[1];

        var foundAtPosition = -1;

        newTextareaText = textarea.value.replaceAll(re_extranet_g, function(found, net, pos) {

        var escapedSeparator = reEscape(opts.extra_networks_add_text_separator);

        var re = new RegExp(escapedSeparator + re_extranet_str, 'g');

        newTextareaText = textarea.value.replaceAll(re, function(found, net, pos) {

            m = found.match(re_extranet);

            if (m[1] == partToSearch) {

                replaced = true;