Fix folder icon text alignment.

- We set the parent view padding to be cellYPadding, so we no longer need to
  account for it when setting the text LayoutParams.

Bug: 191954558
Test: grid where scalableGrid=true and scalableGrid=false (4x5, and 5x5)
Change-Id: I8d7578b2589f801ceef229b663446d868d135ad0

src/com/android/launcher3/folder/FolderIcon.java

@@ -196,7 +196,7 @@ public class FolderIcon extends FrameLayout implements FolderListener, IconLabel
         icon.mFolderName.setText(folderInfo.title);
         icon.mFolderName.setCompoundDrawablePadding(0);
         FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) icon.mFolderName.getLayoutParams();
-        lp.topMargin = grid.cellYPaddingPx + grid.iconSizePx + grid.iconDrawablePaddingPx;
+        lp.topMargin = grid.iconSizePx + grid.iconDrawablePaddingPx;
 
         icon.setTag(folderInfo);
         icon.setOnClickListener(ItemClickHandler.INSTANCE);