Fix /data backup size if contains media subdirs

/data/*/media directories are mistakenly being excluded from the size
calculation. Change to absolute dir exclude so that only /data/media is
excluded.

Change-Id: I6e97604d44e6ea2bdf7dfd8c68a2f90ba6d44415
diff --git a/twrpDU.cpp b/twrpDU.cpp
index d2345d7..28965e1 100644
--- a/twrpDU.cpp
+++ b/twrpDU.cpp
@@ -38,6 +38,9 @@
 		add_relative_dir("..");
 		add_relative_dir("lost+found");
 		add_absolute_dir("/data/data/com.google.android.music/files");
+#ifdef RECOVERY_SDCARD_ON_DATA
+		add_absolute_dir("/data/media");
+#endif
 		parent = "";
 }