fix: don't implicitly mark calls as ringing

[oliverlaz]

Overview

Fixes an issue where reused ringing call instances were implicitly marked as ringing.
For example:

await call.get({ ring: true });
await call.leave();

// This is used to mark the `call` instance as `ringing` 
// and set the `callingState` to `RINGING`
await call.get();

Implementation notes

We don't consider the (past) internal state of the call instance when it is reinitialized. This aligns the behavior with the rest of the SDKs.

• https://getstream.slack.com/archives/C07EV8DFMRN/p1740394903388349

Fixes: #1561 (comment)