Rationalize connected accounts
Rationalize connected accounts

The "On whatever" text should only be shown when there is a connected
account, because otherwise the message says what platform it is. Also
the three conditionals weren't constructed to be parallel.

eXcomm/gratipay.com,mccolgst/www.gittip.com,studio666/gratipay.com,gratipay/gratipay.com,eXcomm/gratipay.com,mccolgst/www.gittip.com,mccolgst/www.gittip.com,eXcomm/gratipay.com,studio666/gratipay.com,gratipay/gratipay.com,bountysource/www.gittip.com,gratipay/gratipay.com,eXcomm/gratipay.com,bountysource/www.gittip.com,studio666/gratipay.com,studio666/gratipay.com,bountysource/www.gittip.com,gratipay/gratipay.com,mccolgst/www.gittip.com,bountysource/www.gittip.com