Reverts part of commit e61905d02f
Fallback to WM_NAME if _NET_WM_NAME does not exist
Also fixes some BadWindow errors that were due to some apps like Steam only populating WM_NAME, and only for certain windows (tooltips count as windows due to the odd way the GUI works on Linux, so they don't have either property)
Freedesktop recommends using _NET_WM_NAME instead of WM_NAME, and on KDE, for example, the difference between them is including the application name for some windows (e.g. "freedesktop - Google Search - Vivaldi" compared to "freedesktop - Google Search")