assets/linux/unregisterBiglyBT: use sh instead of bash & more

also removed the second `if` -- in the case that
the file does not exist the command will silently fail
so the behaviour stays the same

Author: fkobi

assets/linux/unregisterBiglyBT

@@ -0,0 +1,8 @@
+#!/bin/sh
+# This file removed the .desktop file registration from your Desktop Environment
+
+[ -x "$(command -v xdg-desktop-menu)" ] && xdg-desktop-menu uninstall --novendor biglybt.desktop
+# if not executed as root will probably silently fail
+rm -f "/usr/share/applications/biglybt.desktop"
+
+exit 0