Fix migrating save actions with field=first_name

Author: rowanseymour

legacy/definition.go

@@ -538,7 +538,7 @@ func migrateAction(baseLanguage utils.Language, a Action, localization flows.Loc
 			// we can emulate setting only the first name with an expression
 			if a.Field == "first_name" {
 				migratedValue = strings.TrimSpace(migratedValue)
-				migratedValue = fmt.Sprintf("%s @(word_slice(contact.name, 2, -1))", migratedValue)
+				migratedValue = fmt.Sprintf("%s @(word_slice(contact.name, 1, -1))", migratedValue)
 			}
 
 			return &actions.SetContactPropertyAction{

legacy/testdata/migrations/actions.json

@@ -265,7 +265,7 @@
             "type": "set_contact_property",
             "uuid": "5a4d00aa-807e-44af-9693-64b9fdedd352",
             "property": "name",
-            "value": "@run.input @(word_slice(contact.name, 2, -1))"
+            "value": "@run.input @(word_slice(contact.name, 1, -1))"
         },
         "expected_localization": {}
     },