small makeover of member info panel

this removes the style sharing between the verify buttons in the memberinfo panel and
and the encrypted event dialog because the diverge too much now.

src/components/views/elements/DeviceVerifyButtons.js

@@ -114,9 +114,8 @@ export default React.createClass({
             );
         }
 
-        // mx_MemberDeviceInfo because the vector's CSS on EncryptedEventDialog is awful
         return (
-            <div className="mx_MemberDeviceInfo mx_DeviceVerifyButtons" >
+            <div className="mx_DeviceVerifyButtons" >
                 { verifyButton }
                 { blacklistButton }
             </div>