[py] Correct check on DEFAULT_EXECUTABLE_PATH

Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/SeleniumHQ/selenium
Cr-Mirrored-Commit: c0d04ff983a4baeec60d8ba4e9d74111924f265a
diff --git a/selenium/webdriver/firefox/webdriver.py b/selenium/webdriver/firefox/webdriver.py
index 2606411..3141001 100644
--- a/selenium/webdriver/firefox/webdriver.py
+++ b/selenium/webdriver/firefox/webdriver.py
@@ -103,7 +103,7 @@
              HTTP keep-alive.
         """
 
-        if executable_path != 'geckodriver':
+        if executable_path != DEFAULT_EXECUTABLE_PATH:
             warnings.warn('executable_path has been deprecated, please pass in a Service object',
                           DeprecationWarning, stacklevel=2)
         if capabilities is not None or desired_capabilities is not None: