ruby: Don't set default value of nativeEvents capability, it is already set in profile. Fixes issue 4478

Author: barancev

Diff for: rb/lib/selenium/webdriver/firefox/bridge.rb

@@ -11,9 +11,7 @@ def initialize(opts = {})
           http_client = opts.delete(:http_client)
           proxy       = opts.delete(:proxy)
 
-          caps = opts.delete(:desired_capabilities) do
-            Remote::Capabilities.firefox(:native_events => DEFAULT_ENABLE_NATIVE_EVENTS)
-          end
+          caps = opts.delete(:desired_capabilities) || {}
 
           @launcher = create_launcher(port, profile)