Update serial_ext.py

- replaced with oneliner
- removed default arguments

Author: sio13

tools/idf_py_actions/serial_ext.py

@@ -85,12 +85,7 @@ def monitor(action, ctx, args, print_filter, monitor_baud, encrypted):
             monitor_args += ["-p", args.port]
 
         if not monitor_baud:
-            if os.getenv("IDF_MONITOR_BAUD"):
-                monitor_baud = os.getenv("IDF_MONITOR_BAUD", None)
-            elif os.getenv("MONITORBAUD"):
-                monitor_baud = os.getenv("MONITORBAUD", None)
-            else:
-                monitor_baud = project_desc["monitor_baud"]
+            monitor_baud = os.getenv("IDF_MONITOR_BAUD") or os.getenv("MONITORBAUD") or project_desc["monitor_baud"]
 
         monitor_args += ["-b", monitor_baud]
         monitor_args += ["--toolchain-prefix", project_desc["monitor_toolprefix"]]