revert(dankserver): drop userns_mode from arr services

Rootless podman on dankserver already maps container root (PUID=0) to
the dank user (uid 1000) by default — /proc/<pid>/uid_map reads
0->1000, 1..->100000+. Verified across plex, tautulli, jellyfin,
calibre-web, copyparty, romm. userns_mode: host is unnecessary, and
podman-compose 1.5.0 cannot apply it anyway (compose services run in
pods; --userns and --pod cannot be set together). The real fix for the
never-booted arr stack was chowning the root-owned /opt/<svc>/config
dirs to 1000:1000.

dankserver/compose.yaml

@@ -153,7 +153,6 @@ services:
     image: lscr.io/linuxserver/prowlarr:latest
     container_name: prowlarr
     restart: unless-stopped
-    userns_mode: host
     environment:
       - PUID=0
       - PGID=0
@@ -170,7 +169,6 @@ services:
     image: lscr.io/linuxserver/qbittorrent:latest
     container_name: qbittorrent
     restart: unless-stopped
-    userns_mode: host
     environment:
       - PUID=0
       - PGID=0
@@ -188,7 +186,6 @@ services:
     image: lscr.io/linuxserver/radarr:latest
     container_name: radarr
     restart: unless-stopped
-    userns_mode: host
     environment:
       - PUID=0
       - PGID=0
@@ -206,7 +203,6 @@ services:
     image: lscr.io/linuxserver/sonarr:latest
     container_name: sonarr
     restart: unless-stopped
-    userns_mode: host
     environment:
       - PUID=0
       - PGID=0
@@ -224,7 +220,6 @@ services:
     image: lscr.io/linuxserver/lidarr:latest
     container_name: lidarr
     restart: unless-stopped
-    userns_mode: host
     environment:
       - PUID=0
       - PGID=0
@@ -242,7 +237,6 @@ services:
     image: lscr.io/linuxserver/readarr:amd64-1.0.980
     container_name: readarr
     restart: unless-stopped
-    userns_mode: host
     environment:
       - PUID=0
       - PGID=0