fix structure identifier generation

pages/shop/try/artist-premium.vue

@@ -731,7 +731,7 @@ const onStructureNameUpdated = (newName: string) => {
   if (!structureIdentifierModified.value && newName) {
     trialRequest.structureIdentifier = slugify(
       trialRequest.structureName
-    ).replace('-', '')
+    ).replace(/[-_]/g, '')
     checkSubdomainAvailabilityDebounced()
   }
 }