[Glitch] Fix messed up z-index when NoScript blocks media/previews
[Glitch] Fix messed up z-index when NoScript blocks media/previews

Port 04eb59986461bc802d4432fe4131e09eadd070c0 to glitch-soc

Signed-off-by: Thibaut Girka <428c7871dd6adbdc20a11fdac0dfe6a015f06403@sitedethib.com>

glitch-soc/mastodon,glitch-soc/mastodon,im-in-space/mastodon,glitch-soc/mastodon,im-in-space/mastodon,Kirishima21/mastodon,Kirishima21/mastodon,Kirishima21/mastodon,im-in-space/mastodon,glitch-soc/mastodon,im-in-space/mastodon,Kirishima21/mastodon