Bug fix in iOSAudioIODevice::Pimpl::tryBufferSize for iOS 18

[anthony-nicholls]

Thanks again for all the feedback I’ve pushed several changes to develop, including one that should prevent the unnecessary validation.

iOS: Prevent audio glitches when changing sample rate

iOS: Improve performance when detecting and changing buffer sizes

iOS: Improve performance when detecting and changing sample rates

iOS: Set target settings before updating hardware info to reduce the number of device changes

AudioDeviceManager: Skip validation when there is only one device

iOS: Restore sample rate after iterating available sample rates