libfm-qt: update to 1.2.1

Change log:

libfm-qt-1.2.1 / 2023-01-02
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* Specified the parents of context menus for use on Wayland.
* Fixed launching XWayland apps under Wayland.
* appchooserdialog: do not disable the OK button when Custom Command page is shown.
* Increased the minimum width of name column in detailed list view.
* Fixed the DND menu position under Wayland.
* Fixed crash with DND from outside app under Wayland.
* Fixed unresponsive DND menu under Wayland.
* Workaround for DND keyboard modifiers under Wayland.
* Check mime data of clipboard for nullity (for Wayland).
* Fixed drawing of selection rectangle under Wayland.

(gutteridge)