Fix flickering outline on the dialogs while clicking (#1747)

src/components/Modal.tsx

@@ -26,7 +26,6 @@ export const Modal = (props: {
       aria-modal="true"
       onKeyDown={handleKeydown}
       aria-labelledby={props.labelledBy}
-      tabIndex={-1}
     >
       <div className="Modal__background" onClick={props.onCloseRequest}></div>
       <div