Stop trying to commission devices that are not in commissioning mode. (…

…#13794)

SetUpCodePairer was filtering devices by discriminator, but not
checking for a nonzero CM value, so could end up trying to commission
a device that's not commissionable and miss a device with a colliding
discriminator that is.

src/controller/SetUpCodePairer.cpp

@@ -167,6 +167,11 @@ void SetUpCodePairer::OnDiscoveredDeviceOverBleError(void * appState, CHIP_ERROR
 
 bool SetUpCodePairer::NodeMatchesCurrentFilter(const Dnssd::DiscoveredNodeData & nodeData)
 {
+    if (nodeData.commissioningMode == 0)
+    {
+        return false;
+    }
+
     switch (currentFilter.type)
     {
     case Dnssd::DiscoveryFilterType::kShortDiscriminator: