x86/aacpsdsp: fix output of ff_ps_stereo_interpolate_ipdopd_sse3

The fate-aac-al_sbr_ps_04_ur test did not detect this mistake.

libavcodec/x86/aacpsdsp.asm

@@ -163,8 +163,8 @@ align 16
     mulps    m4, m6
     mulps    m5, m7
     addps    m2, m3
-    addsubps m4, m5
     addsubps m2, m4
+    addsubps m2, m5
     movsd  [lq+nq], m2
     movhps [rq+nq], m2
     add      nq, 8