Apply regular expression filter also for check result *messages*

Change-Id: If9bca9e8c38167a6b27ad6e3caa14231bcc9fc05
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-results.ts b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
index c74f6f9..089cf04 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-results.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
@@ -874,7 +874,8 @@
     const filtered = selected.filter(
       result =>
         this.filterRegExp.test(result.checkName) ||
-        this.filterRegExp.test(result.summary)
+        this.filterRegExp.test(result.summary) ||
+        this.filterRegExp.test(result.message ?? '')
     );
     let expanded = this.isSectionExpanded.get(category);
     const expandedByUser = this.isSectionExpandedByUser.get(category) ?? false;