Unable to launch X11 programs on Wayland

[ascent12]

When you're trying to launch a program, DISPLAY is incorrectly getting set to "wayland-0", which is supposed to be for WAYLAND_DISPLAY.
So any X11 programs that get launched would fail to open the X11 display (with Xwayland) and exit.

The offending lines would be:

libfm/src/base/fm-action.c

Lines 734 to 736 in 9ce974e

	data.display = g_app_launch_context_get_display(launch_context,
	G_APP_INFO(action),
	launched_files);

libfm/src/base/fm-action.c

Line 671 in 9ce974e

g_setenv("DISPLAY", data->display, TRUE);

I'm not sure what the purpose of setting DISPLAY like this is, but it seems like g_app_launch_context_get_display is returning WAYLAND_DISPLAY in a wayland session.

[ib]

An attempt was made to fix this in #62. The fix is incorrect.