Remove obsolete --background-service-enabled option

Author: cannorin

autoload/fsharp.vim

@@ -234,7 +234,7 @@ function! fsharp#loadConfig()
     endif
 
     if !exists('g:fsharp#fsautocomplete_command')
-        let g:fsharp#fsautocomplete_command = ['fsautocomplete', '--background-service-enabled']
+        let g:fsharp#fsautocomplete_command = ['fsautocomplete']
     endif
     if !exists('g:fsharp#use_recommended_server_config')
         let g:fsharp#use_recommended_server_config = 1