Update billing global properties

Author: NethmiRodrigo

configuration/backend_configuration/globalproperties/billing-core_demo.xml

@@ -1,9 +1,8 @@
 <config>
     <globalProperties>
         <globalProperty>
-            <property>cashier.systemReceiptNumberGenerator</property>
-            <value>org.openmrs.module.cashier.api.SequentialReceiptNumberGenerator</value>
-            <description>The fully qualified class name of the component responsible for generating sequential receipt numbers within the cashier system. This class contains functions and methods tailored to efficiently generate unique receipt numbers in sequential order. </description>
+            <property>billing.systemReceiptNumberGenerator</property>
+            <value>org.openmrs.module.billing.api.SequentialReceiptNumberGenerator</value>
         </globalProperty>
     </globalProperties>
 </config>