Check if only server file exist, don't check if node_moduels exist

plugin.py

@@ -13,10 +13,11 @@
 
 
 def plugin_loaded():
-    print('LSP-vue: Server {} installed.'.format('is' if os.path.isfile(server_path) else 'is not' ))
+    is_server_installed = os.path.isfile(server_path)
+    print('LSP-vue: Server {} installed.'.format('is' if is_server_installed else 'is not' ))
 
-    # install the node_modules if not installed
-    if not os.path.isdir(os.path.join(package_path, 'node_modules')):
+    # install if not installed
+    if not is_server_installed:
         # this will be called only when the plugin gets:
         # - installed for the first time,
         # - or when updated on package control