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
diff --git a/res/layout/item_subdir.xml b/res/layout/item_subdir.xml
index 578e676..ffe4afe 100644
--- a/res/layout/item_subdir.xml
+++ b/res/layout/item_subdir.xml
@@ -32,6 +32,7 @@
         android:singleLine="true"
         android:ellipsize="end"
         android:textAlignment="viewStart"
-        android:textColor="@color/item_doc_title" />
+        android:textAppearance="@android:style/TextAppearance.Material.Subhead"
+        android:textColor="?android:attr/textColorPrimary" />
 
 </LinearLayout>
diff --git a/res/layout/item_subdir_title.xml b/res/layout/item_subdir_title.xml
index e57acb5..8d0d807 100644
--- a/res/layout/item_subdir_title.xml
+++ b/res/layout/item_subdir_title.xml
@@ -30,5 +30,5 @@
         android:textAlignment="viewStart"
         android:drawablePadding="12dp"
         android:drawableRight="@drawable/ic_breadcrumb_arrow_down"
-        android:textColor="@color/item_doc_title" />
+        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Widget.ActionBar.Title" />
 </LinearLayout>