weston-ini-conf: Add grpc-shell-server to no-activate ini

weston-ini-conf: Add grpc-shell-server to no-activate ini

This embeddeds the grpc-proxy configuration file into the no-activate
configuration file, rather than creating a new no-activate-grpc-proxy,
or no-activate-landscape-grpc-proxy.

The grpc-proxy.cfg file is just a rename of grpc-server.cfg from
meta-agl-demo/ tree, introduced with 1b347d8823, '[weston-ini-conf] Fix
dependency issue with grpc in meta-agl-core'.

Bug-AGL: SPEC-4776
Change-Id: Ie6183887cdb7b6e3f7cb431f01edb8da75e05946
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Suggested-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/28738
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>