Update LanguageSelector.astro: value must be omitted for boolean attr…

…ibutes in html tags

<select>
  👎<option value="/" selected='true'> English </option>       👈 Change from this
  👍<option value="/" selected> English </option>              👈 to this

According HTML5 spec on boolean attributes
- https://www.w3.org/TR/2008/WD-html5-20080610/semantics.html#boolean
If the attribute is present, its value must either be the empty string or a value that is a case-insensitive match for the attribute's canonical name, with no leading or trailing whitespace.

src/components/LanguageSelector.astro

@@ -39,8 +39,12 @@ const { showFlag = false, languageMapping, ...attributes } = Astro.props;
 
       const label = flag + nativeName;
 
+      let selectedAttr = {};
+      if (supportedLanguage === currentLanguage)
+        selectedAttr = { ...selectedAttr, selected: ''};
+
       return (
-        <option value={value} selected={supportedLanguage === currentLanguage}>
+        <option value={value} {...selectedAttr}>
           {label}
         </option>
       );