[19.0][IMP] contract: show the contract name in bold in the list view

[bosd]

Spotted on the 19.0 runboat: contracts look flat next to the sale orders and bills they sit beside in the same menus.

Problem

Odoo puts the identifying column of a document list in bold, so a row can be scanned by its name before anything else.

sale.order:

<field name="name" string="Number" readonly="1" decoration-bf="1"/>

account.move:

<field name="name" decoration-bf="1" .../>

It is a broad convention - decoration-bf appears 61 times across core views. contract_contract_tree_view is the odd one out:

<field name="name" string="Name" />

no decoration-bf, so the contract name renders in normal weight.

Change

Add decoration-bf="1" to that one field.

Not touched

The contract template and contract tag lists also have a plain name column, but those are configuration models rather than documents sitting next to invoices, so they are left alone. The contract line list is left alone too: there name is the line description, and core does not bold the description column of a document's lines either.

Independent of #1517, which touches other columns of the same list.

[bosd]

Folding this into #1427 instead. The revamp commit there already promotes the same field from <h3> to <h1> in the form view, so the list and the form now get the contract name treated consistently in one place rather than two PRs pulling at the same field.

Superseded by #1427; no separate branch needed.