[Audiosharing] Update cancel btn label.

When broadcast is off, the negative btn of share audio dialog should be
"Switch to xxx"

Test: atest
Flag: com.android.settingslib.flags.enable_le_audio_sharing
Bug: 305620450
Change-Id: I8006e2901b8f859d1ee86cbf12d81401e004aa0f

src/com/android/settings/connecteddevice/audiosharing/AudioSharingJoinDialogFragment.java

@@ -158,7 +158,11 @@ public class AudioSharingJoinDialogFragment extends InstrumentedDialogFragment {
                                     dismiss();
                                 })
                         .setCustomNegativeButton(
-                                R.string.audio_sharing_no_thanks_button_label,
+                                getMetricsCategory() == SettingsEnums.DIALOG_START_AUDIO_SHARING
+                                        ? getString(
+                                                R.string.audio_sharing_switch_active_button_label,
+                                                newDeviceName)
+                                        : getString(R.string.audio_sharing_no_thanks_button_label),
                                 v -> {
                                     if (sListener != null) {
                                         sListener.onCancelClick();