D28018: KCM/kwinscripts: fix a warning

zzag added inline comments.

INLINE COMMENTS

> module.cpp:129-133
> +        const bool excludeListing = md.rawData().value("X-KWin-Exclude-Listing").toBool(false);
> +        if (excludeListing) {
>              return false;
>          }
>          return true;

Can be simplified to

  return !md.rawData().value("X-KWin-Exclude-Listing").toBool();

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D28018

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