Sharing page header should follow the new layout introduced in Nextcloud 13

[danxuliu]

As currently the master branch is compatible only with Nextcloud 13 and later the header shown in the sharing page should follow the new layout introduced in Nextcloud 13.

Right now when the file list is being shown in the sharing page the new header is used, but when the Toggle gallery button is clicked the new header is replaced with the old one.

@nextcloud/designers

[danxuliu]

Related issue in server: nextcloud/server#6553

[MorrisJobke]

Time is up for this one -> 13.0.1

[MorrisJobke]

Will this be ready by later today or should we move it to 13.0.2? nextcloud/server#8748

[juliusknorr]

I would just move this to 14 since we can then use the new PublicPageResponse from nextcloud/server#6553. Otherwise we need to workaround for 13 and do an additional implementation for 14.

Related issue for the PublicPageResponse migration #403

[juliusknorr]

Fix is in #425

[MorrisJobke]

Fixed with #425