Typo in CallAutomation_OutboundCalling/src/app.ts

> Please provide us with the following information:
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### This issue is for a: (mark with an `x`)
```
- [X] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
>Purposely make a TextSource / FileSource / SsmlSource fail to reporduce.

### Any log messages given by the failure
>
Call back event received, callConnectionId=xxxx-xxxx-xxxx, serverCallId=yyyyyyyyyy, eventType=Microsoft.Communication.**PlayFailed**

### Expected/desired behavior
>The call should be terminated.

### OS and Version?
> Node.js running on Windows

### Versions
> Commit d46e964 (latest when opening this issue)

### Mention any other details that might be useful
Hello, I'd like to report a type error in line 161 of the file CallAutomation_OutboundCalling/src/app.ts, the event checked should be "Microsoft.Communication.**P**layFailed" but it's "Microsoft.Communication.**p**layFailed".
This causes the call to not be terminated in case of a failure while playing the message.
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