Changed variable name for multiplexed clients

The variable maxNumClients was unused, while connectionsPerClient was
used for spawning multiple proxyPairs. The former is a more appropriate
name for the multiplexing behaviour we use it for.

Multiplexing now just works thanks to implementing ticket #31310.

proxy/config.js

@@ -24,8 +24,6 @@ Config.prototype.defaultBrokerPollInterval = 300.0 * 1000;
 
 Config.prototype.maxNumClients = 1;
 
-Config.prototype.connectionsPerClient = 1;
-
 // TODO: Different ICE servers.
 Config.prototype.pcConfig = {
   iceServers: [

proxy/snowflake.js

@@ -119,7 +119,7 @@ class Snowflake {
   }
 
   makeProxyPair() {
-    if (this.proxyPairs.length >= this.config.connectionsPerClient) {
+    if (this.proxyPairs.length >= this.config.maxNumClients) {
       return null;
     }
     var pair;