x11-wm/fvwm3: Use upstream .desktop file

After upstream accepted a simple .desktop file with a few changes, use
this one until the next upstream version is released.

The main difference is that it uses Type=Application instead of
Type=XSession. According to freedesktop.org specs, Type=XSession does
not exist. Both work fine with sddm, but it's still better to use the
one that conforms to the spec.

PR:		272836

x11-wm/fvwm3/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	fvwm3
 DISTVERSION=	1.0.7
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	x11-wm
 MASTER_SITES=	https://github.com/fvwmorg/fvwm3/releases/download/${DISTVERSION}/ \
 		http://fvwm.sourceforge.net/generated/icon_download/:icons

x11-wm/fvwm3/files/fvwm3.desktop.in

@@ -1,6 +1,5 @@
 [Desktop Entry]
 Name=FVWM3
 Comment=The fvwm3 window manager
-Type=XSession
+Type=Application
 Exec=%%PREFIX%%/bin/fvwm3
-TryExec=%%PREFIX%%/bin/fvwm3