Fix tests

[mokhosh]

Currently if you try to run the tests you get this error:

BeyondCode\LaravelMaskedDumper\Tests\DumperTest::it_can_dump_certain_tables_as_schema_only
Symfony\Component\Console\Exception\CommandNotFoundException: The command "db:dump" does not exist.

Because the actual command has been renamed from db:dump to db:masked-dump but the tests weren't updated.

After fixing that if you run the tests you get this one:

BeyondCode\LaravelMaskedDumper\Tests\DumperTest::it_can_replace_columns_with_faker_values
ArgumentCountError: Too few arguments to function BeyondCode\LaravelMaskedDumper\Tests\DumperTest::BeyondCode\LaravelMaskedDumper\Tests\{closure}(), 1 passed and exactly 2 expected

Because in it_can_replace_columns_with_faker_values we're receiving a $faker as dependency but we're never passing it in DumpSchema.php, and if we add that we become green.

[mpociot]

thank you