[py] Fix invisibility_of_element expected condition init function (#7484)

Author: jklingen92

py/selenium/webdriver/support/expected_conditions.py

@@ -283,7 +283,7 @@ class invisibility_of_element(invisibility_of_element_located):
 
     element is either a locator (text) or an WebElement
     """
-    def __init(self, element):
+    def __init__(self, element):
         self.target = element