Transceiver: fix integer division in addRadioVector()
Transceiver: fix integer division in addRadioVector()

By default, C/C++ compiler does assume integer division.  The
lack of explicit cast to 'double' causes the transceiver to
ignore non-decimal attenuation values (x % 10 > 0):

  txFullScale * 10 ^ ( -3 / 10)
	== txFullScale * 10 ^ 0
	== txFullScale * 1.0

  txFullScale * 10 ^ ( -8 / 10)
	== txFullScale * 10 ^ 0
	== txFullScale * 1.0

  txFullScale * 10 ^ (-10 / 10)
	== txFullScale * 10 ^ -1
	== txFullScale * 0.1

  txFullScale * 10 ^ (-18 / 10)
	== txFullScale * 10 ^ -1
	== txFullScale * 0.1

Change-Id: I85b1063f57f630d90c6da32827bec4a05afc6514
Related: SYS#4918

osmocom/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx