Remove isMirrored hardcoded parameter value from execution of createDiskOffering API through UI (apache#10474)

Co-authored-by: Julien Hervot de Mattos Vaz <[email protected]>

Author: julien-vaz

ui/src/views/offering/AddDiskOffering.vue

@@ -491,7 +491,6 @@ export default {
         const formRaw = toRaw(this.form)
         const values = this.handleRemoveFields(formRaw)
         var params = {
-          isMirrored: false,
           name: values.name,
           displaytext: values.displaytext,
           storageType: values.storagetype,