[FIX] account: correct domain evaluation

'is set' filter is the equivalent to != False
A many2one has not the value True but an ID

Closes #15749

addons/account/views/account_view.xml

@@ -1068,7 +1068,7 @@
                                                 class="oe_link"
                                                 type="object"
                                                 string="-> View partially reconciled entries"
-                                                attrs="{'invisible': ['|', ('full_reconcile_id', '=', True), '&', ('matched_debit_ids', '=', []),('matched_credit_ids', '=', [])]}">
+                                                attrs="{'invisible': ['|', ('full_reconcile_id', '!=', False), '&', ('matched_debit_ids', '=', []),('matched_credit_ids', '=', [])]}">
                                             </button>
                                         </div>
                                     </group>