[RD-34891] Assign w3c property on the command executor. (#382)

Author: erustusagutu

appium/webdriver/webdriver.py

@@ -226,6 +226,7 @@ def start_session(self, capabilities, browser_profile=None):
 
         # Double check to see if we have a W3C Compliant browser
         self.w3c = response.get('status') is None
+        self.command_executor.w3c = self.w3c
 
     def _merge_capabilities(self, capabilities):
         """