RemoteLinux: set a default QmlRunCommand

If there is no device qmlRunCommand even though it is a remote device
QmlProjectRunConfiguration uses a desktop path and on windows
that results in wrong file separators ->
"\usr\bin\appcontroller ..."

Task-number: QDS-9994
Change-Id: I054addf86922b50bc2e2f620d536953b72ee3331
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/remotelinux/linuxdevice.cpp

@@ -978,6 +978,7 @@ LinuxDevice::LinuxDevice()
     addDeviceAction({Tr::tr("Open Remote Shell"), [](const IDevice::Ptr &device, QWidget *) {
                          device->openTerminal(Environment(), FilePath());
                      }});
+    setQmlRunCommand(filePath("qml"));
 }
 
 void LinuxDevice::_setOsType(Utils::OsType osType)