SurfaceControl: Correct setMatrix parameter naming.

The first parameter dsdx controls the X scaling. The last parameter
is called dtdy but controls the Y scaling. Clearly this was meant to be
named dsdy. You can verify this with a quick look at Transaction_test.

Test: Tried various stuff, phone still works.
Change-Id: Ie9e898443350ffdcf227888a8d85efdbe1b6b033
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 2f83c0e..f45f2a1 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -1733,7 +1733,7 @@
 bool Layer::setMatrix(const layer_state_t::matrix22_t& matrix) {
     mCurrentState.sequence++;
     mCurrentState.requested.transform.set(
-            matrix.dsdx, matrix.dsdy, matrix.dtdx, matrix.dtdy);
+            matrix.dsdx, matrix.dtdy, matrix.dtdx, matrix.dsdy);
     mCurrentState.modified = true;
     setTransactionFlags(eTransactionNeeded);
     return true;