pbr: update to 1.2.2-20

pbr: update to 1.2.2-20

Maintainer: me
Compile tested: x86_64, Dell EMC Edge620, OpenWrt 25.12.4
Run tested: x86_64, Dell EMC Edge620, OpenWrt 25.12.4

Description:
Update to version 1.2.2-20

  - Bump PKG_RELEASE to 20.
  - Add Erik Conijn as a co-maintainer.

files/etc/init.d/pbr:
  - Update packageCompat to 27.
  - Standardize gateway warning messages.
  - Add ubus_get_data helper for improved error/warning handling.
  - Preserve JSON namespace in json() for better error handling.
  - Refine device retrieval logic for OpenVPN interfaces.
  - Improve display of IPv4/IPv6 gateways for consistency.
  - Adjust service start trigger to only block on errors, not warnings.
  - Ensure 'error' field is populated in ubus status when no gateways
    are available.

files/etc/uci-defaults/90-pbr:
  - Remove sed rule for '/etc/pbr/' to '/usr/share/pbr/' path
    update.

Signed-off-by: Stan Grishin <redacted>