Fix TS errors in client code

    ERROR in (...)/node_modules/@prezly/slate-editor/build/components/TooltipV2/index.d.ts(1,32):
    TS2307: Cannot find module './TooltipV2' or its corresponding type declarations.

See: microsoft/TypeScript#35822

packages/slate-editor/src/components/TooltipV2/DisabledTriggerOverlay/DisabledTriggerOverlay.tsx

@@ -3,7 +3,7 @@ import React, { FunctionComponent } from 'react';
 
 import './DisabledTriggerOverlay.scss';
 
-interface Props {
+export interface Props {
     className?: string;
     onHide: () => void;
     onShow: () => void;