Fix positioning of 1 pixel wide lines (esp. non AA lines.)

Change-Id: Ic155cac72f351edae35dffdfbb236954f57ba7de
diff --git a/libs/hwui/Line.h b/libs/hwui/Line.h
index 820793c..64bdd6a 100644
--- a/libs/hwui/Line.h
+++ b/libs/hwui/Line.h
@@ -93,7 +93,7 @@
                 mXDivs, mYDivs, mXDivsCount, mYDivsCount);
 
         tx = -gLineAABias;
-        ty = lineWidth == 1.0f ? -gLineAABias : -half - gLineAABias;
+        ty = lineWidth <= 1.0f ? -gLineAABias : -half - gLineAABias;
     }
 
     inline GLvoid* getVertices() const {