Set floating and fullscreen window to non dedicated.

[WuuBoLin]

Is there a specific reason why floating and fullscreen windows are set as dedicated windows?
Popup windows cannot be displayed when spawned from a floating window because exwm-layout--refresh-other calls switch-to-prev-buffer.

I encountered this issue while using VMware Workstation and Virt-manager within exwm. For example, when creating a new VM (which opens in a floating window) and trying to select a local ISO file, the file chooser dialog cannot be shown because it's another floating window.

Removing all instances of (set-window-dedicated-p window t) resolves this issue.