KillAppStep: Always finish the step with success

Fixes: QTCREATORBUG-30024
Change-Id: I7f2f3167bd3620a5a313fe6359c4ee58ff0d9e03
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/remotelinux/killappstep.cpp

@@ -58,7 +58,11 @@ GroupItem KillAppStep::deployRecipe()
         addProgressMessage(Tr::tr("Failed to kill remote application. "
                                     "Assuming it was not running."));
     };
-    return DeviceProcessKillerTask(setupHandler, doneHandler, errorHandler);
+    const Group root {
+        finishAllAndDone,
+        DeviceProcessKillerTask(setupHandler, doneHandler, errorHandler)
+    };
+    return root;
 }
 
 KillAppStepFactory::KillAppStepFactory()