Reverting changes done to item_subdir and item_subdir_title.

Previously, I thought these two layouts were used for folders.
Apparently they are being used for DropdownBreadcrumb ... and only that.
Reverting back to their previous stylings.

Original change was at ag/1585189 and ag/1615035.

Bug: 33488647
Change-Id: I9f527e8e3aadd6c51194ffeed0fc834e98f3bb9a