Fix watchrtc consecutive call issue

[subhamcyara]

Following PR contains the following changes :

1. Update watchRTC SDK version to 1.38.2
2. remove persistentEnd call to fix web socket connect/disconnect when conducting consecutive calls.

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[saghul]

So is it no longer necessary to make that API call?

[subhamcyara]

Yes. We do not require that API call with new changes within our sdk. It helps to curb unnecessarily connect/disconnect (or reconnect) of websocket connections for calls.

[saghul]

Jenkins please test this please.

[saghul]

Ops this fell trough the cracks due to the holydays. Can you please give it a rebase?

[subhamcyara]

Hi, I think I did a mistake while merging. I rectified and seems okay now. Please let me know if something seems off.

[saghul]

Jenkins please test this please.