.gitignore: update for jme3-dark-laf

.gitignore

@@ -81,6 +81,7 @@
 /sdk/jme3-vehicle-creator/build/
 /sdk/jme3-welcome-screen/build/
 /sdk/jme3-glsl-support/build/
+/sdk/jme3-dark-laf/build/
 /sdk/nbproject/private/
 /sdk/jme3-scenecomposer/nbproject/private/
 /sdk/jme3-core/nbproject/private/
@@ -140,4 +141,4 @@
 /sdk/BasicGameTemplate/nbproject/private/
 /sdk/nbi/stub/ext/components/products/jdk/build/
 /sdk/nbi/stub/ext/components/products/jdk/dist/
-/sdk/jme3-dark-laf/nbproject/private/
+/sdk/jme3-dark-laf/nbproject/private/