wallpapers/image: fix wrong usage of `std::bind`
`m_virtualDesktopInfo->currentDesktop()` will be regarded as a static value in `std::bind`, which prevents the current desktop from being updated, so use lambda instead. BUG: 459199 FIXED-IN: 5.26
`m_virtualDesktopInfo->currentDesktop()` will be regarded as a static value in `std::bind`, which prevents the current desktop from being updated, so use lambda instead. BUG: 459199 FIXED-IN: 5.26
mentioned in commit 2eb89785
·mentioned in commit 2eb89785