UI: Fix Linux build without PulseAudio

Commit 31d36691 missed updating a couple of lines while moving
settings around.

- https://github.com/obsproject/obs-studio/commit/31d36691

UI/window-basic-settings.cpp

@@ -468,8 +468,8 @@ OBSBasicSettings::OBSBasicSettings(QWidget *parent)
 #endif
 
 #if !defined(_WIN32) && !defined(__APPLE__) && !HAVE_PULSEAUDIO
-	delete ui->advAudioGroupBox;
-	ui->advAudioGroupBox = nullptr;
+	delete ui->audioAdvGroupBox;
+	ui->audioAdvGroupBox = nullptr;
 #endif
 
 #ifdef _WIN32