Add VFO_TX handling (VFOB) to kenwood_set_split_vfo

rigs/kenwood/kenwood.c

@@ -1319,6 +1319,8 @@ int kenwood_set_split_vfo(RIG *rig, vfo_t vfo, split_t split, vfo_t txvfo)
 
     if (vfo == RIG_VFO_CURR) { vfo = rig->state.current_vfo; }
 
+    if (vfo == RIG_VFO_TX) vfo == split ? RIG_VFO_B: RIG_VFO_A;
+
     switch (vfo)
     {
     case RIG_VFO_A: vfo_function = '0'; break;

rigs/kenwood/kenwood.h

@@ -28,7 +28,7 @@
 #include "token.h"
 #include "misc.h"
 
-#define BACKEND_VER "20220119a"
+#define BACKEND_VER "20229293"
 
 #define EOM_KEN ';'
 #define EOM_TH '\r'