Fix local communities marked as federated in the database by #3075

[kartikynwa]

Fixes #3256

[dessalines]

Thanks for this one.

[Neshura87]

@kartikynwa How did you add the migration? Just manually create the files or is there some process I need to follow?

[kartikynwa]

@Neshura87 you have first install diesel's CLI: https://github.com/diesel-rs/diesel/tree/master/diesel_cli

Then generate empty empty migrations using diesel migration generate mingration_name. This will create empty SQL files. You will then have to populate these files with SQL statements.

The process is similar to what is described here: http://diesel.rs/guides/getting-started.html

[Neshura87]

thx