Dont match exact rocketchat title

The title varies so we don't try to match it exactly.

Fixes #659

test/behave/features/rocketchat.feature

@@ -19,5 +19,3 @@ Scenario: Login to rocketchat
   And I enter the "rocketchat" "password" in the inputfield "#pass"
   And I click on the button ".login"
   Then I wait on element ".rooms-list" for 25000ms to be visible
-  And I expect that the title is "Rocket.Chat"
-