[#1305] fix overlay panel appended inside another

webui/src/app/config-checker-preference-picker/config-checker-preference-picker.component.html

@@ -7,7 +7,7 @@
     <ng-template pTemplate="caption">
         <div class="p-d-flex p-mt-1 p-ai-center">
             Checkers list
-            <app-help-tip title="Checkers list">
+            <app-help-tip title="Checkers list" appendTo="body">
                 <p>
                     The table lists available review checkers. Each of them is responsible for analyzing the daemon
                     configuration to detect some particular issue. The table contains the checker states,