RoundScreen examples in ui-test

A DeviceConfigurationOverride that overrides whether the screen is round for the contained content.

DeviceConfigurationOverrideRoundScreenSample

@Sampled
@Composable
fun DeviceConfigurationOverrideRoundScreenSample() {
    DeviceConfigurationOverride(DeviceConfigurationOverride.RoundScreen(true)) {
        LocalConfiguration.current.isScreenRound // will be true
    }
}