Set default protocol to http in TLS integration test

test/integration/connect/envoy/case-ingress-gateway-tls/config_entries.hcl

@@ -1,25 +1,34 @@
 enable_central_service_config = true
 
 config_entries {
-  bootstrap {
+  bootstrap = [
-    kind = "ingress-gateway"
+    {
-    name = "ingress-gateway"
+      kind = "proxy-defaults"
-
+      name = "global"
-    tls {
+      config {
-      enabled = true
-    }
-
-    listeners = [
-      {
-        port = 9999
         protocol = "http"
-        services = [
-          {
-            name = "s1"
-            hosts = ["test.example.com"]
-          }
-        ]
       }
-    ]
+    },
-  }
+    {
+      kind = "ingress-gateway"
+      name = "ingress-gateway"
+
+      tls {
+        enabled = true
+      }
+
+      listeners = [
+        {
+          port = 9999
+          protocol = "http"
+          services = [
+            {
+              name = "s1"
+              hosts = ["test.example.com"]
+            }
+          ]
+        }
+      ]
+    }
+  ]
 }