Fix minor brush persistence issue

bukkit/src/main/java/com/boydti/fawe/bukkit/block/BrushBoundBaseBlock.java

@@ -51,6 +51,7 @@ public class BrushBoundBaseBlock extends BaseBlock implements BrushHolder {
                 try {
                     this.tool = BrushTool.fromString(player, session, json);
                     this.tool.setHolder(this);
+                    brushCache.put(getKey(item), tool);
                 } catch (Throwable ignore) {
                     ignore.printStackTrace();
                 }

core/src/main/java/com/boydti/fawe/object/brush/BrushSettings.java

@@ -72,6 +72,7 @@ public class BrushSettings {
         String args = constructor.substring(constructor.indexOf(' ') + 1);
         String[] parentArgs = new String[]{"brush", split[0]};
         BrushSettings bs = (BrushSettings) sphereCommand.call(args, locals, parentArgs);
+        bs.constructor.put(SettingType.BRUSH, constructor);
         if (settings.containsKey(SettingType.PERMISSIONS.name())) {
             bs.permissions.addAll((Collection<? extends String>) settings.get(SettingType.PERMISSIONS.name()));
         }

core/src/main/java/com/sk89q/worldedit/command/tool/BrushTool.java

@@ -297,6 +297,7 @@ public class BrushTool implements DoubleActionTraceTool, ScrollTool, MovableTool
         current.clearPerms();
         current.setBrush(brush);
         current.addPermission(permission);
+        update();
     }
 
     /**