Move knowledge of query parameters out of boot1.js

src/html/HtmlExactSpecFilter.js

@@ -10,16 +10,13 @@ jasmineRequire.HtmlExactSpecFilter = function() {
 
     /**
      * Create a filter instance.
-     * @param options Object with a filterString method, which should
-     * return the value of the "spec" query string parameter set by
-     * {@link HtmlReporter}.
+     * @param options Object with a queryString property, which should be an
+     * instance of {@link QueryString}.
      */
     constructor(options) {
-      if (typeof options?.filterString !== 'function') {
-        throw new Error('options.filterString must be a function');
-      }
-
-      this.#getFilterString = options.filterString;
+      this.#getFilterString = function() {
+        return options.queryString.getParam('spec');
+      };
     }
 
     /**