CTS regression fix (#585)

* CTS regression fix

* PR review update

src/common.speech/Transcription/TranscriberRecognizer.ts

@@ -116,8 +116,10 @@ export class TranscriberRecognizer extends Recognizer {
         const audioConfigImpl = this.audioConfig as AudioConfigImpl;
         const format: AudioStreamFormatImpl = await audioConfigImpl.format;
         const channels = format.channels;
-        if (channels === 1 && this.properties.getProperty("f0f5debc-f8c9-4892-ac4b-90a7ab359fd2", "false").toLowerCase() !== "true") {
-            throw new Error("Single channel audio configuration for ConversationTranscriber is currently under private preview, please contact diarizationrequest@microsoft.com for more details");
+        if (channels === 1) {
+            if (this.properties.getProperty("f0f5debc-f8c9-4892-ac4b-90a7ab359fd2", "false").toLowerCase() !== "true") {
+                throw new Error("Single channel audio configuration for ConversationTranscriber is currently under private preview, please contact diarizationrequest@microsoft.com for more details");
+            }
         } else if (channels !== 8) {
             throw new Error(`Unsupported audio configuration: Detected ${channels}-channel audio`);
         }