add quotes around the arguments (minor stylistic thing)

- also remove 'exact call:': that's kind of obvious

mpsd-software-environment.py

@@ -408,8 +408,8 @@ def run(*args, counter=[0], **kwargs):
 
     # provide information about upcoming subprocess.run call
     logging.info(f"{token} Starting subprocess.run('{command}') with options {options}")
-    logging.debug(f"{token}   getcwd={os.getcwd()}")
-    logging.debug(f"{token}   exact call: subprocess.run({arg})")
+    logging.debug(f'''{token}   getcwd={os.getcwd()}''')
+    logging.debug(f'''{token}   subprocess.run("{arg}")''')
 
     time_start = time.time()
     process = subprocess.run(*args, **kwargs)