Fix action token sending for chracters that are escaped in html

The function body of escape is
```
def escape(s):
    """Replace the characters ``&``, ``<``, ``>``, ``'``, and ``"`` in
    the string with HTML-safe sequences. Use this if you need to display
    text that might contain such characters in HTML.

    If the object has an ``__html__`` method, it is called and the
    return value is assumed to already be safe for HTML.

    :param s: An object to be converted to a string and escaped.
    :return: A :class:`Markup` string with the escaped text.
    """
    if hasattr(s, "__html__"):
        return Markup(s.__html__())
    return Markup(
        text_type(s)
        .replace("&", "&amp;")
        .replace(">", "&gt;")
        .replace("<", "&lt;")
        .replace("'", "&#39;")
        .replace('"', "&#34;")
    )
```
It doesn't make sense to lookup the replaced values in the database,
and it breaks single-quotes in the email username portion, which is
valid https://en.wikipedia.org/wiki/Email_address#Syntax

lib/galaxy/managers/users.py

@@ -488,7 +488,7 @@ def send_activation_email(self, trans, email, username):
         """
         Send the verification email containing the activation link to the user's email.
         """
-        activation_token = self.__get_activation_token(trans, escape(email))
+        activation_token = self.__get_activation_token(trans, email)
         activation_link = url_for(controller='user', action='activate', activation_token=activation_token, email=escape(email), qualified=True)
         host = self.__get_host(trans)
         custom_message = ''