[freeboxos] Fix command handling for DECT thing type (openhab#17274)

Related to comment in openhab#17262

Signed-off-by: Laurent Garnier <lg.hc@free.fr>

bundles/org.openhab.binding.freeboxos/src/main/java/org/openhab/binding/freeboxos/internal/api/rest/PhoneManager.java

@@ -20,6 +20,8 @@
 import org.openhab.binding.freeboxos.internal.api.FreeboxException;
 import org.openhab.binding.freeboxos.internal.api.Response;
 
+import com.google.gson.annotations.SerializedName;
+
 /**
  * The {@link PhoneManager} is the Java class used to handle api requests related to phone and calls
  *
@@ -38,6 +40,7 @@ protected class StatusResponse extends Response<Status> {
     }
 
     private enum NetworkStatus {
+        @SerializedName("working")
         WORKING,
         UNKNOWN
     }
@@ -47,7 +50,9 @@ public static record Config(NetworkStatus network, boolean dectEcoMode, String d
     }
 
     public enum Type {
+        @SerializedName("fxs")
         FXS,
+        @SerializedName("dect")
         DECT,
         UNKNOWN
     }