bts: TC_rsl_ms_pwr_dyn_down: Fix expected MS Power level

Related: OS#4244
Change-Id: I62c468b27d05fbff4a98ea24981188689f5899d3
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 25721e3..87c9131 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -2160,7 +2160,7 @@
 
 	/* update power param to enable power loop
 	 as per spec the supplied ms power IE should set the max allowed power...*/
-	RSL.send(ts_RSL_MS_PWR_CTRL_with_pp(g_chan_nr, pwr_var));
+	RSL.send(ts_RSL_MS_PWR_CTRL_with_pp(g_chan_nr, pwr_target_val));
 
 	/* wait, then check that our power level was increased */
 	timer T1 := 10.0;