Fix PanzernCommand for glass blocks

BauSystem_Main/src/de/steamwar/bausystem/features/slaves/panzern/PanzernCommand.java

@@ -123,7 +123,7 @@ public class PanzernCommand extends SWCommand {
             if (!material.isBlock()) {
                 continue;
             }
-            if (material.name().contains("STAIRS") || material.name().contains("SLAB")) {
+            if (material.name().contains("STAIRS") || material.name().contains("SLAB") ||  material.name().contains("GLASS")) {
                 strings.add(material.name().toLowerCase());
             }
         }