chore: remove variables from xml serializeMap

[trivikr]

Issue #, if available:
Similar to #1153

Description of changes:
remove variables from xml serializeMap

Before:

const serializeAws_restXmlS3UserMetadata = (
  input: { [key: string]: string },
  context: __SerdeContext
): any => {
  const collectedNodes: any = [];
  Object.keys(input).forEach(key => {
    const entryNode = new __XmlNode("entry");
    const keyNode = new __XmlNode("NonEmptyMaxLength1024String")
      .addChildNode(new __XmlText(key))
      .withName("key");
    entryNode.addChildNode(keyNode);
    const node = new __XmlNode("MaxLength1024String").addChildNode(
      new __XmlText(input[key])
    );
    entryNode.addChildNode(node.withName("value"));
    collectedNodes.push(entryNode);
  });
  return collectedNodes;
};

After:

const serializeAws_restXmlS3UserMetadata = (
  input: { [key: string]: string },
  context: __SerdeContext
): any => {
  return Object.keys(input).map(key => {
    const entryNode = new __XmlNode("entry");
    const keyNode = new __XmlNode("NonEmptyMaxLength1024String")
      .addChildNode(new __XmlText(key))
      .withName("key");
    entryNode.addChildNode(keyNode);
    const node = new __XmlNode("MaxLength1024String").addChildNode(
      new __XmlText(input[key])
    );
    entryNode.addChildNode(node.withName("value"));
    return entryNode;
  });
};

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[aws-sdk-js-automation]

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• CodeBuild project: sdk-staging-test
• Commit ID: b518cff
• Result: SUCCEEDED
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[alexforsyth]

Sweet. I like the JS style. LGTM

[lock]

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