Remove outdated iframe sandbox attribute (#12633)

Signed-off-by: Michael Telatynski <[email protected]>

Author: t3chguy

src/components/views/messages/MFileBody.tsx

@@ -288,7 +288,7 @@ export default class MFileBody extends React.Component<IProps, IState> {
                                 src={url}
                                 onLoad={() => this.downloadFile(this.fileName, this.linkText)}
                                 ref={this.iframe}
-                                sandbox="allow-scripts allow-downloads allow-downloads-without-user-activation"
+                                sandbox="allow-scripts allow-downloads"
                             />
                         </div>
                     )}

src/utils/FileDownloader.ts

@@ -47,7 +47,7 @@ function getManagedIframe(): { iframe: HTMLIFrameElement; onLoadPromise: Promise
 
     // @ts-ignore
     // noinspection JSConstantReassignment
-    managedIframe.sandbox = "allow-scripts allow-downloads allow-downloads-without-user-activation";
+    managedIframe.sandbox = "allow-scripts allow-downloads";
 
     onLoadPromise = new Promise((resolve) => {
         managedIframe.onload = () => {