Fix r8500 tuning steps

rigs/icom/icom.c

@@ -176,7 +176,7 @@ const struct ts_sc_list r8500_ts_sc_list[] =
     {50, 0x01},
     {100, 0x02},
     {kHz(1), 0x03},
-    {12500, 0x04},
+    {2500, 0x04},
     {kHz(5), 0x05},
     {kHz(9), 0x06},
     {kHz(10), 0x07},

rigs/icom/icom.h

@@ -35,7 +35,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20240922"
+#define BACKEND_VER "20241001"
 
 #define ICOM_IS_ID31 rig_is_model(rig, RIG_MODEL_ID31)
 #define ICOM_IS_ID51 rig_is_model(rig, RIG_MODEL_ID51)