Fix Icom to set filter#0 when datamode=0

https://github.com/Hamlib/Hamlib/issues/1598

rigs/icom/icom.c

@@ -2575,6 +2575,7 @@ int icom_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
             }
             else
             {
+                if (datamode[0] == 0) datamode[1] = 0;
                 retval = icom_set_mode_x26(rig, vfo, mode, mode_icom, datamode[0], datamode[1]);
             }
 

rigs/icom/icom.h

@@ -35,7 +35,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20240815"
+#define BACKEND_VER "20240823"
 
 #define ICOM_IS_ID31 rig_is_model(rig, RIG_MODEL_ID31)
 #define ICOM_IS_ID51 rig_is_model(rig, RIG_MODEL_ID51)