pyln: Set the correct envvar for logging for rust plugins

Author: cdecker

contrib/pyln-testing/pyln/testing/utils.py

@@ -598,7 +598,7 @@ def __init__(
         self.disconnect_file = None
 
         self.rpcproxy = bitcoindproxy
-        self.env['CLN_PLUGIN_LOG'] = "gl_plugin=trace,gl_rpc=trace,gl_grpc=trace,debug"
+        self.env['CLN_PLUGIN_LOG'] = "cln_plugin=trace,cln_rpc=trace,cln_grpc=trace,debug"
 
         self.opts = LIGHTNINGD_CONFIG.copy()
         opts = {