Allow scrolling folders in when all apps is disabled.

Allows for more items to be added into a folder.
Allows for scrolling by letting the content area inside the scroll view to be taller.
The height of content area was capped in https://googleplex-android-review.git.corp.google.com/#/c/387583/

Change-Id: I8d7950ac9c155e26c5a299c17ae6a2bbf829dce6
diff --git a/src/com/android/launcher3/CellLayout.java b/src/com/android/launcher3/CellLayout.java
index fa6ce96..2436a51 100644
--- a/src/com/android/launcher3/CellLayout.java
+++ b/src/com/android/launcher3/CellLayout.java
@@ -199,7 +199,7 @@
         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CellLayout, defStyle, 0);
 
         mCellWidth = mCellHeight = -1;
-        mFixedCellHeight = mFixedCellHeight = -1;
+        mFixedCellWidth = mFixedCellHeight = -1;
         mWidthGap = mOriginalWidthGap = 0;
         mHeightGap = mOriginalHeightGap = 0;
         mMaxGap = Integer.MAX_VALUE;