fix uninitialized variables in GLConsumer

mDefaultWidth, mDefaultHeight and mCurrentScallingMode are now
initialized to the same default value that BufferQueue uses.

Change-Id: I0d4da2022b06419d12745716d8ddbd48c8869953
diff --git a/include/gui/GLConsumer.h b/include/gui/GLConsumer.h
index 3b8dd77..f0a75dc 100644
--- a/include/gui/GLConsumer.h
+++ b/include/gui/GLConsumer.h
@@ -323,7 +323,7 @@
     uint32_t mCurrentTransform;
 
     // mCurrentScalingMode is the scaling mode for the current texture. It gets
-    // set to each time updateTexImage is called.
+    // set each time updateTexImage is called.
     uint32_t mCurrentScalingMode;
 
     // mCurrentFence is the fence received from BufferQueue in updateTexImage.