Update mate-hud icon with one that is Yaru style

gen_icons.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 dir="$( dirname "$(readlink -f "$0")" )"
 
@@ -7,7 +7,7 @@ if [ ! -f "${dir}"/usr/share/pixmaps/mate-hud.svg ] ; then
 	exit 1
 fi
 
-if [ ! `which inkscape 2>/dev/null` ] ; then
+if ! which inkscape 2>/dev/null; then
 	echo "inkscape required to convert svg to png"
 	exit 1
 fi
@@ -18,13 +18,15 @@ for d in 16 22 24 32 48 64 128 256 512 1024; do
 	install -dm755 "${dir}"/usr/share/icons/hicolor/${d}x${d}/apps
 	inkscape -w ${d} -h ${d} "${dir}"/usr/share/pixmaps/mate-hud.svg \
 	                -o "${dir}"/usr/share/icons/hicolor/${d}x${d}/apps/mate-hud.png
+	optipng -strip all -o7 "${dir}"/usr/share/icons/hicolor/${d}x${d}/apps/mate-hud.png
 done
 
 for d in 16 22 24 32 48 64 128 256; do
 	d2=$(( $d * 2 ))
 	install -dm755 "${dir}"/usr/share/icons/hicolor/${d}x${d}@2/apps
 	inkscape -w ${d2} -h ${d2} "${dir}"/usr/share/pixmaps/mate-hud.svg \
 	                -o "${dir}"/usr/share/icons/hicolor/${d}x${d}@2/apps/mate-hud.png
+	optipng -strip all -o7 "${dir}"/usr/share/icons/hicolor/${d}x${d}@2/apps/mate-hud.png
 done
 
 install -Dm644 "${dir}"/usr/share/pixmaps/mate-hud.svg \