Fix passing file to languagetool

test/command_callback/test_languagetool_command_callback.vader

@@ -6,10 +6,10 @@ After:
 
 Execute(The default command should be correct):
   AssertLinter 'languagetool', ale#Escape('languagetool')
-  \ . ' --autoDetect '
+  \ . ' --autoDetect %s'
 
 Execute(Should be able to set a custom executable):
   let g:ale_languagetool_executable = 'foobar'
 
   AssertLinter 'foobar' , ale#Escape('foobar')
-  \   . ' --autoDetect '
+  \   . ' --autoDetect %s'