Revert "Clicking a link in the HTML reporter does exact filtering"

This change broke spec filtering in Karma by changing the format of the
`spec` query parameter. Although karma-jasmine-html-reporter uses
jasmine-core's HtmlSpecFilter, karm-jasmine provides its own spec filter
that interprets the query parameters itself.

This feature may be reintroduced in 6.0 as a breaking change.

This reverts commit 8309416cb2.

src/html/HtmlSpecFilter.js

@@ -1,25 +1,11 @@
 jasmineRequire.HtmlSpecFilter = function() {
-  /**
-   * @name HtmlSpecFilter
-   * @classdesc Legacy HTML spec filter, for backward compatibility
-   * with boot files that predate {@link HtmlExactSpecFilter}.
-   * @param options Object with a filterString method
-   * @constructor
-   * @deprecated
-   * @since 1.2.0
-   */
   // Legacy HTML spec filter, preserved for backward compatibility with
   // boot files that predate HtmlExactSpecFilterV2
   function HtmlSpecFilter(options) {
-    let filterString = (options && options.filterString()) || '';
-
-    if (filterString.startsWith('[')) {
-      // Convert an HtmlExactSpecFilterV2 string into something we can use
-      filterString = JSON.parse(filterString).join(' ');
-    }
-
-    filterString = filterString.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
-
+    const filterString =
+      options &&
+      options.filterString() &&
+      options.filterString().replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
     const filterPattern = new RegExp(filterString);
 
     /**