In icom.c fix reading VFOB width when 0 and set to VFOA width

https://github.com/Hamlib/Hamlib/issues/665
https://github.com/Hamlib/Hamlib/issues/654

rigs/icom/icom.c

@@ -2137,6 +2137,7 @@ int icom_get_mode(RIG *rig, vfo_t vfo, rmode_t *mode, pbwidth_t *width)
                 rig_set_vfo(rig, RIG_VFO_B);
                 retval = icom_get_dsp_flt(rig, *mode);
                 *width = retval;
+                if (*width == 0) *width = rig->state.cache.widthMainA; // we'll use VFOA's width
                 // dont' really care about cache time here
                 // this is just to prevent vfo swapping while getting width
                 rig->state.cache.widthMainB = retval;

rigs/icom/icom.h

@@ -30,7 +30,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20210408"
+#define BACKEND_VER "20210418"
 
 /*
  * defines used by comp_cal_str in rig.c