UI: Disable Youtube bandwidth test (for now)

Due to reports that the bandwidth test is randomly causing community
strikes on Youtube (likely due to bad automatic detection), the
bandwidth test will be disabled for Youtube until the Youtube API is
implemented.

UI/window-basic-auto-config.cpp

@@ -416,6 +416,7 @@ void AutoConfigStreamPage::UpdateKeyLink()
 {
 	bool custom = ui->streamType->currentIndex() == 1;
 	QString serviceName = ui->service->currentText();
+	bool isYoutube = false;
 
 	if (custom)
 		serviceName = "";
@@ -433,6 +434,15 @@ void AutoConfigStreamPage::UpdateKeyLink()
 		text += "\">";
 		text += QTStr("Basic.AutoConfig.StreamPage.StreamKey.LinkToSite");
 		text += "</a>";
+
+		isYoutube = true;
+	}
+
+	if (isYoutube) {
+		ui->doBandwidthTest->setChecked(false);
+		ui->doBandwidthTest->setEnabled(false);
+	} else {
+		ui->doBandwidthTest->setEnabled(true);
 	}
 
 	ui->streamKeyLabel->setText(text);