Fix runtime configuration for EMR Serverless

Error: Unsupported attribute
│ 
│   on ../terraform-aws-emr/modules/serverless/main.tf line 170, in resource "aws_emrserverless_application" "this":
│  170:       classification = runtime_configuration.value.classification
│     ├────────────────
│     │ runtime_configuration.value is list of object with 1 element
│ 
│ Can't access attributes on a list of objects. Did you mean to access attribute "classification" for a specific element of the list, or across all elements of the list?
╵
╷
│ Error: Unsupported attribute
│ 
│   on ../terraform-aws-emr/modules/serverless/main.tf line 171, in resource "aws_emrserverless_application" "this":
│  171:       properties     = runtime_configuration.value.properties
│     ├────────────────
│     │ runtime_configuration.value is list of object with 1 element
│ 
│ Can't access attributes on a list of objects. Did you mean to access attribute "properties" for a specific element of the list, or across all elements of the list?
╵

Author: trandafo

modules/serverless/main.tf

@@ -164,7 +164,7 @@ resource "aws_emrserverless_application" "this" {
   }
 
   dynamic "runtime_configuration" {
-    for_each = var.runtime_configuration != null ? [var.runtime_configuration] : []
+    for_each = var.runtime_configuration != null ? var.runtime_configuration : []
 
     content {
       classification = runtime_configuration.value.classification