Fix uninitialized dragEnabled default to true.

Author: Zach Glueckert

src/gov/nasa/worldwind/render/PointPlacemark.java

@@ -189,7 +189,7 @@ public Vec4 getTerrainPoint()
     protected WWTexture activeTexture; // determined each frame
 
     protected boolean highlighted;
-    protected boolean dragEnabled;
+    protected boolean dragEnabled = true;
     protected DraggableSupport draggableSupport = null;
     protected boolean visible = true;
     protected int altitudeMode = WorldWind.CLAMP_TO_GROUND;