Exclude material3-xr group from scripts/copy

Also, delete copyMaterial3.sh as it is covered by a newer pair of scripts: copyComposerMaterial3.sh and copyComposerMaterial3Adaptive.sh

Author: eymar

scripts/copy/copyComposeMaterial3.sh

@@ -1 +1 @@
-$(dirname "$0")/impl/copyToJbMain.sh 'compose/material3' ':(exclude)compose/material3/adaptive'
+$(dirname "$0")/impl/copyToJbMain.sh 'compose/material3' ':(exclude)compose/material3/adaptive' ':(exclude)compose/material3/material3-xr' ':(exclude)compose/material3/material3-xr-adaptive'