Camera: Set the correct default value for brighntess.

Setting the luma-adaption default value to 3.
diff --git a/QualcommCameraHardware.cpp b/QualcommCameraHardware.cpp
index 8ceffbd..a8654d3 100755
--- a/QualcommCameraHardware.cpp
+++ b/QualcommCameraHardware.cpp
@@ -950,7 +950,7 @@
     mParameters.set(CameraParameters::KEY_MAX_SATURATION,
             CAMERA_MAX_SATURATION);
 
-    mParameters.set("luma-adaptation", "18");
+    mParameters.set("luma-adaptation", "3");
     mParameters.set("zoom-supported", "true");
     mParameters.set("max-zoom", MAX_ZOOM_LEVEL);
     mParameters.set("zoom", 0);