Simply calculation of sample projections in WM+GM
Simply calculation of sample projections in WM+GM

Directly use mbmi->mv[0] since the displacment of block center has
been calculated according to GM/WM model and stored in mbmi->mv[0].

Change-Id: I09bc88832d80197fccbb1df1518ad33fafa9756f

GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,smarter/aom