Fix indentation error (#2539)

Author: elliterate

py/selenium/webdriver/safari/webdriver.py

@@ -46,7 +46,7 @@ def __init__(self, executable_path=None, port=0,
          - desired_capabilities: Dictionary object with desired capabilities (Can be used to provide various Safari switches).
         """
         if not executable_path is None:
-	    executable_path = os.environ.get("SELENIUM_SERVER_JAR")
+            executable_path = os.environ.get("SELENIUM_SERVER_JAR")
         self.service = Service(executable_path, port=port, quiet=quiet, use_legacy=use_legacy_driver)
         self.service.start()