Fix datamode set in icom.c to use 0x00 0x00 per the manual for 7300 and 9700

https://github.com/Hamlib/Hamlib/issues/448

rigs/icom/icom.c

@@ -1627,7 +1627,6 @@ int icom_set_mode_with_data(RIG *rig, vfo_t vfo, rmode_t mode,
             datamode[0] = 0x00;
             break;
         }
-
         if (width != RIG_PASSBAND_NOCHANGE)
         {
             if (filter_byte)   // then we need the width byte too
@@ -1638,7 +1637,7 @@ int icom_set_mode_with_data(RIG *rig, vfo_t vfo, rmode_t mode,
                 // since width_icom is 0-2 for rigs that need this here we have to make it 1-3
                 datamode[1] = datamode[0] ? width_icom : 0;
                 retval =
-                    icom_transaction(rig, C_CTL_MEM, dm_sub_cmd, datamode, width_icom == -1 ? 1 : 2,
+                    icom_transaction(rig, C_CTL_MEM, dm_sub_cmd, datamode, 2,
                                      ackbuf,
                                      &ack_len);
             }