feat: remove --agent-string option

Does not need to be configurable on the CLI.

waku/factory/external_config.nim

@@ -141,12 +141,6 @@ type WakuNodeConf* = object
       name: "cluster-id"
     .}: uint16
 
-    agentString* {.
-      defaultValue: "nwaku",
-      desc: "Node agent string which is used as identifier in network",
-      name: "agent-string"
-    .}: string
-
     nodekey* {.desc: "P2P node private key as 64 char hex string.", name: "nodekey".}:
       Option[PrivateKey]
 

waku/factory/node_factory.nim

@@ -96,7 +96,7 @@ proc initNode(
     nameResolver = dnsResolver,
     sendSignedPeerRecord = conf.relayPeerExchange,
       # We send our own signed peer record when peer exchange enabled
-    agentString = some(conf.agentString),
+    agentString = some("nwaku"),
   )
   builder.withColocationLimit(conf.colocationLimit)
   builder.withPeerManagerConfig(