Fix: Use string format for electrum servers host:port with prepare.

- Added temp check if config using old object-format servers and convert them to the strings and saves to basicswap.json.

basicswap/bin/run.py

@@ -371,6 +371,19 @@ def runClient(
     with open(settings_path) as fs:
         settings = json.load(fs)
 
+    # TEMP:
+    config_changed = False
+    for coin_name, coin_data in settings.get("chainclients", {}).items():
+        for key in ["electrum_clearnet_servers", "electrum_onion_servers"]:
+            servers = coin_data.get(key)
+            if servers and isinstance(servers, list) and len(servers) > 0:
+                if isinstance(servers[0], dict):
+                    coin_data[key] = [f"{s['host']}:{s['port']}" for s in servers]
+                    config_changed = True
+    if config_changed:
+        with open(settings_path, "w") as fs:
+            json.dump(settings, fs, indent=4)
+
     swap_client = BasicSwap(
         data_dir, settings, chain, log_name=log_prefix, extra_opts=extra_opts
     )