[IMP] partner_statement: remove "blocked" feature

If someone comes from v17 or older Odoo versions, and they still have "blocked" lines, there are three options for them:

- Develop glue module with another module that contains "blocked" field.
- Don't use this commit.
- Solve the "blocked" lines.

Good luck!

partner_statement/views/activity_statement.xml

@@ -37,7 +37,7 @@
                 <tr
                     t-foreach="currency['lines']"
                     t-as="line"
-                    t-att-class="('statement-blocked ' if line['blocked'] else '') + ('statement-reconciled ' if line['reconciled_line'] else '') + ('statement-outside-date-rank' if line['outside-date-rank'] else '')"
+                    t-att-class="('statement-reconciled ' if line['reconciled_line'] else '') + ('statement-outside-date-rank' if line['outside-date-rank'] else '')"
                 >
                     <td>
                         <span