[REF] account_asset,sale: invisible attr in form view

When the invisible attr doesn't need to be evaluated (e.g. = "1"),
it is better not to specify it within the attrs as they are
automacally re-evaluted at each field changed.

We directly write "invisible=1" instead.

The JS framework supports both, but we encourage the later one.

addons/account_asset/views/account_asset_views.xml

@@ -19,7 +19,7 @@
                         </h1>
                     </div>
                     <group>
-                        <field name="type" attrs="{'invisible': 1}"/>
+                        <field name="type" invisible="1"/>
                         <field name="company_id" options="{'no_create': True}" groups="base.group_multi_company"/>
                     </group>
                     <group string="Journal Entries">

addons/sale/wizard/sale_make_invoice_advance_views.xml

@@ -15,7 +15,7 @@
                             attrs="{'invisible': [('count','>',1)]}"/>
                         <field name="product_id"
                             context="{'search_default_services': 1, 'default_type': 'service', 'default_invoice_policy': 'order'}" class="oe_inline"
-                            attrs="{'invisible': 1}"/>
+                            invisible="1"/>
                         <label for="amount" attrs="{'invisible': [('advance_payment_method', 'not in', ('fixed','percentage'))]}"/>
                         <div attrs="{'invisible': [('advance_payment_method', 'not in', ('fixed','percentage'))]}">
                             <field name="amount"