chore: fix 'includes' path in demo 'tsconfig.json'
chore: fix 'includes' path in demo 'tsconfig.json'

Closes #2512
ng-bootstrap/core,ng-bootstrap/ng-bootstrap,maxokorokov/core,ktriek/ng-bootstrap,ktriek/ng-bootstrap,benouat/ng-bootstrap,ng-bootstrap/core,ng-bootstrap/ng-bootstrap,jnizet/ng-bootstrap,jnizet/ng-bootstrap,fbasso/ng-bootstrap,ng-bootstrap/ng-bootstrap,jnizet/ng-bootstrap,ktriek/ng-bootstrap,fbasso/ng-bootstrap,jnizet/ng-bootstrap,ktriek/ng-bootstrap,fbasso/ng-bootstrap,maxokorokov/core,maxokorokov/core,ng-bootstrap/core,benouat/ng-bootstrap,fbasso/ng-bootstrap,ng-bootstrap/ng-bootstrap,maxokorokov/core,benouat/ng-bootstrap,benouat/ng-bootstrap