Remove unnecessary checking of SDN as it is always set via api.SetDefaults in frontend PutOrPatch

pkg/installer/generateconfig.go

@@ -104,10 +104,7 @@ func (m *manager) generateInstallConfig(ctx context.Context) (*installconfig.Ins
 		masterZones = []string{""}
 	}
 
-	SoftwareDefinedNetwork := string(api.SoftwareDefinedNetworkOpenShiftSDN)
-	if m.oc.Properties.NetworkProfile.SoftwareDefinedNetwork != "" {
-		SoftwareDefinedNetwork = string(m.oc.Properties.NetworkProfile.SoftwareDefinedNetwork)
-	}
+	SoftwareDefinedNetwork := string(m.oc.Properties.NetworkProfile.SoftwareDefinedNetwork)
 
 	// determine outbound type based on cluster visibility
 	outboundType := azuretypes.LoadbalancerOutboundType