Debugger: Fix state of instruction wise operation button

Task-number: QTCREATORBUG-20714
Change-Id: Ie45fcb288a5e6a566a38b35d375b703c9c5a2326
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/debugger/debuggerengine.cpp

@@ -486,6 +486,7 @@ void DebuggerEngine::start()
         d->m_runTool->runControl()->setApplicationProcessHandle(d->m_inferiorPid);
 
     action(OperateByInstruction)->setEnabled(hasCapability(DisassemblerCapability));
+    action(OperateByInstruction)->setChecked(boolSetting(OperateByInstruction));
 
     QTC_ASSERT(state() == DebuggerNotReady || state() == DebuggerFinished,
          qDebug() << state());