fix(pwa): Replace closeTag parameter with voidTag for HtmlWebpackPlugin (#6518)

HtmlWebpackPlugin has a voidTag parameter that needs to be set to true
so that both <link> and <meta> are treated as void elements (with no
contents). The closeTag parameter doesn't exist.

https://github.com/jantimon/html-webpack-plugin/blob/570f735c237d4a03a65622cfe64652431aca4132/typings.d.ts#L280
https://html.spec.whatwg.org/multipage/syntax.html#void-elements

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Author: tcitworld

packages/@vue/cli-plugin-pwa/lib/HtmlPwaPlugin.js

@@ -225,10 +225,10 @@ module.exports = class HtmlPwaPlugin {
   }
 }
 
-function makeTag (tagName, attributes, closeTag = false) {
+function makeTag (tagName, attributes, voidTag = true) {
   return {
     tagName,
-    closeTag,
+    voidTag,
     attributes
   }
 }