Delete Tagesschau.de.xml

Duplicate of tagesschau.de.xml, covers less subdomains

Fixes https://github.com/EFForg/https-everywhere/issues/454
Update passwordscon.org.xml

Add securecookies from PasswordsCon.org.xml

Merges in extra rulesets to help fix https://github.com/EFForg/https-everywhere/issues/453 - Site drops www, so keeping it in the other ruleset is reundant, meaning this is better
Delete PasswordsCon.org.xml

Duplicate of passwordscon.org.xml

Fixes https://github.com/EFForg/https-everywhere/issues/453