fix(draw-io): make applicationConfig prop optional to fix lint warning

[mmattel]

References: #322 (fix(draw-io): make applicationConfig prop optional)

The prop has a default value, so it should not be marked as required. Fixes: vue/no-required-prop-with-default

@LukasHirt pls double check if this fixes the issue correctly

Attempt to fix the linter warning:

+ pnpm lint

> web-extensions@ lint /drone/src
> eslint '{packages,support}/**/*.{js,ts,vue}' '*.{ts,js}' --color


/drone/src/packages/web-app-draw-io/src/App.vue
  34:5  warning  Prop "applicationConfig" should be optional  vue/no-required-prop-with-default

✖ 1 problem (0 errors, 1 warning)

[LukasHirt]

Notice the previous comment in the code. According to it, the correct solution would be to remove the default value instead. Which probably entails some deeper issue given the workaround.

[mmattel]

Closing because the referenced PR got closed