fix validate open app in platform nt

pospro

@@ -33,13 +33,21 @@ class SingleInstanceApp(QApplication):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
+        app_open = False
+        num_opens = 0
         for process in psutil.process_iter(['pid', 'name', 'cmdline']):
             name = process.info['name']
             cmdline = process.info['cmdline']
-            if name == PROCESS_NAME or (isinstance(cmdline, list) and 'pospro' in cmdline):
-                logger.error('La aplicación ya esta en ejecución')
-                self.show_already_running_dialog()
-                sys.exit(1)
+            if name == PROCESS_NAME and OS_NAME == 'posix':
+                app_open = True
+            elif OS_NAME == 'nt' and isinstance(cmdline, list) and 'pospro' in cmdline):
+                num_opens += 1
+
+        if app_open or num_opens > 1:
+            logger.error('La aplicación ya esta en ejecución')
+            self.show_already_running_dialog()
+            sys.exit(1)
+
 
     def show_already_running_dialog(self):
         msg = QMessageBox()