fixed warning when terminating scenarios

warning was:
Source Variable "Var.Execution_Control.PhaseLists.tabbox.
PFGroupChat.tab.
SYSF_SFTF_IMS_CallTerm_PF_GroupChat_not_expected_message_more_SC.
TerminateGroup" is read-only or value is not allowed

Change-Id: I144117cee72bfd98f345a52252a26a13d4489bb4
Signed-off-by: Balazs Barcsik <balazs.barcsik@gmail.com>

src/ExecCtrl/EPTF_CLL_ExecCtrl_Functions.ttcn

@@ -12276,7 +12276,7 @@ group R3 {
       f_EPTF_ExecCtrl_stopScenarioGroupOnLGens(vl_scenarioGroupIdx);
       // set the GroupStart button to false:
       f_EPTF_Var_adjustContent(f_EPTF_ExecCtrl_getScenarioGroupInstanceIsRunningVarIdx(vl_scenarioGroupIdx), {boolVal := false});
-      return false;
+      return true;
     }
     private function f_EPTF_ExecCtrl_UIVars_resetScenarioGroup(