DSK: Add fallbacks for TERMINAL

.config/dsk/dskrc

@@ -8,7 +8,12 @@
 #
 
 export XDG_CURRENT_DESKTOP="KDE"
-export TERMINAL="konsole"
+for term in konsole xfce4-terminal urxvt xterm; do
+	if command -v "$term" > /dev/null 2>&1; then
+		export TERMINAL="$term"
+		break
+	fi
+done
 
 export DSK_FLAG_MASK=""
 export DSK_CURRENT_DESKTOP="$DSK_NAME"