Revert OnFinality node for Aleph Zero - confirmed deprecated

The previous commit added OnFinality's public-ws endpoint as a
failover, based on search results that turned out to be stale.
Direct WebSocket handshake test against
wss://aleph-zero.api.onfinality.io/public-ws returns HTTP 200 with an
"API Deprecated" HTML body, not a real upgrade - OnFinality has retired
free public access for this specific chain (their other chains'
public-ws endpoints, e.g. Altair/Bittensor, still work fine, so this
is Aleph-Zero-specific, not a platform-wide change). Keeping a
non-functional node in the config is worse than no fix, since it
masks the real failure mode. See conversation/memory for the fuller
investigation (dRPC's public endpoint completes a WS handshake but
rejects standard RPC methods; ws.azero.dev itself is a real, current,
likely-transient outage - the Foundation's main site is healthy).

chains/v22/android/chains.json

@@ -5154,15 +5154,10 @@
         }
       }
     ],
-    "nodeSelectionStrategy": "roundRobin",
     "nodes": [
       {
         "url": "wss://ws.azero.dev",
         "name": "Aleph Zero node"
-      },
-      {
-        "url": "wss://aleph-zero.api.onfinality.io/public-ws",
-        "name": "OnFinality"
       }
     ],
     "explorers": [