Resolve "set frame to non-estimated removes its state blocks"

Closes #268 (closed)

src/frame/frame_base.cpp

@@ -140,7 +140,8 @@ void FrameBase::setNonEstimated()
 {
     // unregister if previously estimated
     if (isKeyOrAux())
-        removeStateBlocks(getProblem());
+        for (const auto& sb : getStateBlockVec())
+            getProblem()->notifyStateBlock(sb, REMOVE);
 
     type_ = NON_ESTIMATED;
     if (getTrajectory())