Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1480

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1242

.. as per the default bridge config.

Source: f848710c01/mautrix_twitter/example-config.yamll (L147)

This upgrade is technically not needed due to 1.49.1 and 1.49.2 being identical with a lone fix to Debian packaging being the only change. 

Still some might want us to be on the absolutely latest version even tho these 2 are practically identical.

ARM64 has yet to be built so this has to wait for that before merge.

This update fixes a sync issue that would cause some users to experience sync issues that could cause initial sync to completely fail.

Related to https://github.com/matrix-org/synapse/issues/11604

Getting an upstream fix is preferable. In any case, it's probably nice
to have this defined explicitly in our configuration. This way, people
can more easily discover that they can override the URL preview
language.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1468

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1461

The domain is invalid with space, so it shouldn't be here

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1464

Remove references to sqlite since we should just use postgres from the
outset.

Updates based off the variable names used in mautrix-facebook role.

Also update port number in defauts/main.yml, and disable presence
checking, because Twitter doesn't support that.

Source: 12f420ab95/mautrix_twitter/example-config.yaml

find roles/matrix-bridge-mautrix-twitter -type f -exec sed -i \
  -e 's/facebook/twitter/g' \
  -e 's/Facebook/Twitter/g' \
  -e 's/FB/Twitter/g' \
  -e 's/fb/twitter/g' {} +

Ref: https://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdk

* Upgrade Mjolnir from 1.1.20 to version 1.2.1

https://hub.docker.com/r/matrixdotorg/mjolnir/tags

using the "latest" tag seems inefficient as it doesn't actually redirect to the latest release

In any case, the latest release is now 1.2.1

docker pull matrixdotorg/mjolnir:v1.2.1

* Fixup

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

The check was checking for an empty string in `matrix_jitsi_prosody_auth_internal_accounts`,
which is unlikely to happen. We should check for an empty list instead.

The check was not validating username/password values, so telling the user that they need a non-empty
username/password is misleading. It was merely checking if there's at least one entry in the list.

This patch adjusts the check and message accordingly.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1447

Seems like there's such a variable in the
`matrix-bridge-appservice-slack` role, which is probably where it got
copied over from.