[FIX] point_of_sale: remove fullscreen

Most occurences of the fullscreen feature have
been removed in the below revision:
eebdbb677fdee1163c16ec2bb967f37e1e4b69e

Only the field has been left.

This isn't allowed to go fullscreen
without a direct user click
by most browsers, for security
purposes.

opw-658838

addons/point_of_sale/point_of_sale.py

@@ -98,6 +98,7 @@ class pos_config(osv.osv):
         'iface_scan_via_proxy' : fields.boolean('Scan via Proxy', help="Enable barcode scanning with a remotely connected barcode scanner"),
         'iface_invoicing': fields.boolean('Invoicing',help='Enables invoice generation from the Point of Sale'),
         'iface_big_scrollbars': fields.boolean('Large Scrollbars',help='For imprecise industrial touchscreens'),
+        # TODO master: remove the `iface_fullscreen` field. This is no longer used.
         'iface_fullscreen':     fields.boolean('Fullscreen', help='Display the Point of Sale in full screen mode'),
         'iface_print_auto': fields.boolean('Automatic Receipt Printing', help='The receipt will automatically be printed at the end of each order'),
         'iface_print_skip_screen': fields.boolean('Skip Receipt Screen', help='The receipt screen will be skipped if the receipt can be printed automatically.'),

addons/point_of_sale/point_of_sale_view.xml

@@ -688,7 +688,6 @@
                                 <field name="iface_tax_included" />
                             </group>
                             <group>
-                                <field name="iface_fullscreen" />
                                 <field name="iface_big_scrollbars" />
                                 <field name="iface_print_auto" />
                                 <field name="iface_display_categ_images" />