e2fsprogs: Add missing colon in FILESEXTRAPATHS

:Release Notes:
Without it, other bbappends cannot add more elements to it.

:Detailed Notes:

:Testing Performed:
Only build tested.

:QA Notes:
No change to image.

:Issues Addressed:
[ES-1190] Ongoing metadata improvement/cleanup work

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: I2089773a2e51a2e8716dddfb499fd580b3190cf4
Originally-reviewed-on: https://gpro.palm.com/57664
Reviewed-on: https://g2g.palm.com/6428
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>