Fix minor bugs

desktop_env/server/main.py

@@ -41,7 +41,7 @@ def execute_command():
     shell = data.get('shell', False)
     command = data.get('command', "" if shell else [])
 
-    if isinstance(command, str):
+    if isinstance(command, str) and not shell:
         command = shlex.split(command)
 
     # Execute the command without any safety checks.
@@ -66,7 +66,7 @@ def launch_app():
     shell = data.get("shell", False)
     command: List[str] = data.get("command", "" if shell else [])
 
-    if isinstance(command, str):
+    if isinstance(command, str) and not shell:
         command = shlex.split(command)
 
     try: