Fix minor formatting issue in AppRegistry logging in non-dev builds

[rshest]

Summary:

Changelog:

[Internal] -

I was looking at the logs, troubleshooting a non-dev build issue, and noticed a line:

I0429 15:56:42.107558 1874554880: Running "MyApplication

In __DEV__ mode this usually continues with " with ..., but in release mode the closing quote was missing, which made me think there may be something going on garbling the log messages.

Which ultimately was a red herring, and it's just a bad formatting in the message in release mode, which this change fixes.

Differential Revision: D56704170