fix: To allow multiple query strings as an OR statement (#383)

Author: bdandoy

examples/complete-alb/main.tf

@@ -137,10 +137,14 @@ module "alb" {
           }]
 
           conditions = [{
-            query_string = {
+            query_string = [{
               key   = "video"
               value = "random"
-            }
+              },
+              {
+                key   = "image"
+                value = "next"
+            }]
           }]
         }
       }

main.tf

@@ -422,7 +422,7 @@ resource "aws_lb_listener_rule" "this" {
 
     content {
       dynamic "query_string" {
-        for_each = try([condition.value.query_string], [])
+        for_each = try(flatten([condition.value.query_string]), [])
 
         content {
           key   = try(query_string.value.key, null)