[FIX] base_setup: fix image parsing error on save

Issue

	- Have 2 languages installed
	- Install Invoicing & Website
	- Go in Settings
	- Search "logo" (image)
	- Upload a logo for your website
	- Save
	- Search "Default terms & conditions" (translatable field)
	- Click on the translate button (e.g. EN if you are in
	  english)

	A popup will appears saying that you should save your
	changes.

	- Click on Save & do not edit translation (not needed)
	- Search "logo"

	Image disappeared

Cause

	When saving, a read is called. By default, read has
	bin_size to true to avoid performances issues.
	It will return the image size instead of the content

	This is why the image disappeared.

Solution

	As configuration is dirty, you are forced to save &
	it will always read with bin_size set to true.

	My solution would be to set it to false for settings.

OPW-2208232