Fix execute_async_script tests for IE

Author: p0deje

rb/spec/integration/selenium/webdriver/driver_spec.rb

@@ -277,7 +277,7 @@ def save_screenshot_and_assert(path)
 
       describe 'execute async script' do
         before do
-          driver.manage.timeouts.script_timeout = 0
+          driver.manage.timeouts.script_timeout = 1
           driver.navigate.to url_for('ajaxy_page.html')
         end