MOBILE-3063 reading: Hide iframe help and core iframe

Author: crazyserver

src/core/directives/format-text.ts

@@ -997,7 +997,7 @@ export class CoreFormatTextDirective implements OnChanges, OnDestroy, AsyncDirec
     protected addIframeHelp(iframe: HTMLIFrameElement): void {
         const helpDiv = document.createElement('div');
 
-        helpDiv.classList.add('ion-text-center', 'ion-text-wrap');
+        helpDiv.classList.add('ion-text-center', 'ion-text-wrap', 'core-iframe-help');
 
         const button = document.createElement('ion-button');
         button.setAttribute('fill', 'clear');

src/theme/components/reading-mode.scss

@@ -35,7 +35,7 @@ body.core-reading-mode-enabled {
 
     &.core-reading-mode-multimedia-hidden {
         ion-content.core-reading-mode-content {
-            img, video, iframe {
+            img, video, iframe, core-iframe, .core-iframe-help {
                 display: none !important;
             }
         }