fix(call flow): connecting manually

Changes:
- When the Room views is loaded both clients, caller and callee must use the 'Connect' button to start peer connection or in this case start calling.

Workaround:
- When we received the media streams couple of times we just only need to add one video element, so this is done by using replaceWith() method from jqLite. We will replace the element until we receive the final media streams.