Fix: Anti-Aliasing node contrast limit has no effect

The Anti-Aliasing node contrast limit has no effect. This is due to a
typo in the code, where the threshold was used internally as the
contrast limit instead.

source/blender/nodes/composite/nodes/node_composite_antialiasing.cc

@@ -77,7 +77,7 @@ class AntiAliasingOperation : public NodeOperation {
    * algorithm expects it in the [0, 10] range. */
   float get_local_contrast_adaptation_factor()
   {
-    return node_storage(bnode()).threshold * 10.0f;
+    return node_storage(bnode()).contrast_limit * 10.0f;
   }
 
   /* Blender encodes the corner rounding factor in the float [0, 1] range, while the SMAA algorithm