Game and poll messages send by the bridge to matrix each include a command the
receiver might want to run (to play the game or to vote in the poll).
But these command suggestions did always include the "!tg" command prefix, even
if the command prefix was changed to a different value in the config. That
could lead to the bridge ignoring the exact command it suggested earlier.
With this commit, these messages contain the correct command prefix as defined
in the config so that the command suggestions can be executed by the user
without manually correcting the prefix.
Cy Nhr
50cd878f13