Default value for WaterFogData plane distance

Set the default WaterFogData plane distance to be the same as global
bounds.  This solves an issue with the connection's control object
mistakenly thinking it is under a water plane in a debug build.

Engine/source/scene/fogStructs.h

@@ -59,7 +59,7 @@ struct WaterFogData
       wetDepth = 0.0f;
       wetDarkening = 0.0f;
       color.set( 0.5f, 0.5f, 0.5f, 1.0f );
-      plane.set( 0.0f, 0.0f, 1.0f );
+      plane.set( 0.0f, 0.0f, 1.0f, 1e10 ); // Default to global bounds distance
       depthGradMax = 0.0f;
    }
 };