meta-webos: unify indentation in shell tasks

* this change is only aesthetic (unlike indentation in python tasks)
* some recipes were using tabs (replaced in previous patch)
* some are using 8 spaces
* some mix of 8 spaces for 1st level and then 4 spaces
* sometimes there were only 7 spaces..
* unify it to use 4 spaces everywhere

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@palm.com>
Change-Id: I82ec048221effab5ae2bb0d10a7520191c3a2d9e
Reviewed-on: http://g2g.palm.com/1120
Reviewed-by: Martin Jansa <martin.jansa@palm.com>
Tested-by: Martin Jansa <martin.jansa@palm.com>
Reviewed-by: Susan Montooth <susan.montooth@palm.com>