Use proper placeholder for mandate title message

message.xml

@@ -19,7 +19,7 @@ this repository contains the full copyright notices and license terms. -->
             <field name="text">The party "%(party)s" is missing a "%(type)s" identifier.</field>
         </record>
         <record model="ir.message" id="msg_mandate_title">
-            <field name="text">SEPA $(scheme)s Direct Debit MANDATE</field>
+            <field name="text">SEPA %(scheme)s Direct Debit MANDATE</field>
         </record>
         <record model="ir.message" id="msg_mandate_authorisation_statement">
             <field name="text">By signing this mandate form, you authorise (A) %(creditor)s to send instructions to your bank to debit your account and (B) your bank to debit your account in accordance with the instructions from %(creditor)s.</field>