[rb] fix linter issues

Author: titusfortner

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

@@ -44,9 +44,9 @@ module Firefox
                                      page: {width: 30})).to include(magic_number)
           end
 
-          it 'should print full page', except: [{ ci: :github,
-                                                  platform: :windows,
-                                                  reason: 'Some issues with resolution?' },
+          it 'should print full page', except: [{ci: :github,
+                                                 platform: :windows,
+                                                 reason: 'Some issues with resolution?'},
                                                 {platform: :macosx,
                                                  headless: true,
                                                  reason: 'showing half resolution of what expected'}] do

rb/spec/integration/selenium/webdriver/spec_helper.rb

@@ -53,7 +53,7 @@
     guards.add_condition(:browser, GlobalTestEnv.browser)
     guards.add_condition(:ci, WebDriver::Platform.ci)
     guards.add_condition(:platform, WebDriver::Platform.os)
-    guards.add_condition(:headless, !!ENV['HEADLESS'])
+    guards.add_condition(:headless, !ENV['HEADLESS'].nil?)
 
     results = guards.disposition
     send(*results) if results

rb/spec/integration/selenium/webdriver/takes_screenshot_spec.rb

@@ -93,8 +93,8 @@ def save_screenshot_and_assert(source, path)
 
         it 'takes full page screenshot', exclusive: {browser: :firefox},
                                          except: [{ci: :github,
-                                                    platform: :windows,
-                                                    reason: 'Some issues with resolution?'},
+                                                   platform: :windows,
+                                                   reason: 'Some issues with resolution?'},
                                                   {platform: :macosx,
                                                    headless: true,
                                                    reason: 'showing half resolution of what expected'}] do