[rb] still need to use driver finder when using capabilities parameter

Author: titusfortner

rb/lib/selenium/webdriver/common/local_driver.rb

@@ -42,6 +42,7 @@ def process_options(options, capabilities, service)
           WebDriver.logger.deprecate("The :capabilities parameter for #{self.class}",
                                      ":options argument with an instance of #{self.class}",
                                      id: :capabilities)
+          service.executable_path ||= WebDriver::DriverFinder.path(capabilities, service.class)
           generate_capabilities(capabilities)
         else
           options ||= default_options