Implement cleanUpFilter method in SoftBloomFilter (#2611)

* Implement cleanUpFilter method in SoftBloomFilter

Added cleanUpFilter method to properly clean up passes.

* Fix variable naming for downsampling and upsampling passes

Author: capdevon

jme3-effects/src/main/java/com/jme3/post/filters/SoftBloomFilter.java

@@ -173,7 +173,17 @@ public void beforeRender() {
         material.setFloat("GlowFactor", glowFactor);
 
         initialized = true;
-        
+    }
+
+    @Override
+    protected void cleanUpFilter(Renderer r) {
+        for (Pass p : downsamplingPasses) {
+            p.cleanup(r);
+        }
+        for (Pass p : upsamplingPasses) {
+            p.cleanup(r);
+        }
+        initialized = false;
     }
 
     @Override