Don't show empty 3 dots in Message Composer when there aren't any more buttons (#8023)

src/components/views/rooms/MessageComposerButtons.tsx

@@ -101,11 +101,11 @@ const MessageComposerButtons: React.FC<IProps> = (props: IProps) => {
 
     return <UploadButtonContextProvider roomId={roomId} relation={props.relation}>
         { mainButtons }
-        <AccessibleTooltipButton
+        { moreButtons.length > 0 && <AccessibleTooltipButton
             className={moreOptionsClasses}
             onClick={props.toggleButtonMenu}
             title={_t("More options")}
-        />
+        /> }
         { props.isMenuOpen && (
             <ContextMenu
                 onFinished={props.toggleButtonMenu}