chore: remove rlnRelayTreePath

apps/chat2/chat2.nim

@@ -567,7 +567,6 @@ proc processInput(rfd: AsyncFD, rng: ref HmacDrbgContext) {.async.} =
         ),
         userMessageLimit: conf.rlnRelayUserMessageLimit,
         epochSizeSec: conf.rlnEpochSizeSec,
-        treePath: conf.rlnRelayTreePath,
       )
 
       waitFor node.mountRlnRelay(rlnConf, spamHandler = some(spamHandler))

apps/chat2/config_chat2.nim

@@ -282,12 +282,6 @@ type
       name: "rln-relay-epoch-sec"
     .}: uint64
 
-    rlnRelayTreePath* {.
-      desc: "Path to the RLN merkle tree sled db (https://github.com/spacejam/sled)",
-      defaultValue: "",
-      name: "rln-relay-tree-path"
-    .}: string
-
 # NOTE: Keys are different in nim-libp2p
 proc parseCmdArg*(T: type crypto.PrivateKey, p: string): T =
   try: