[Dbix-class] Small fix for DBIx::Class::Schema::Loader::DBI::mysql

[Nilson Santos Figueiredo Junior]

The attached patch fixes an issue where Schema::Loader would dump
useless unique constraints when loading from MySQL. The current
(unfixed) output looks like:

__PACKAGE__->set_primary_key("id");
__PACKAGE__->add_unique_constraint("name", ["name"]);
__PACKAGE__->add_unique_constraint(["name"], undef);
__PACKAGE__->add_unique_constraint(["id"], undef);

If you've got a primary key "id" and an additional unique constraint
"name", for example.

The correct output should be:

__PACKAGE__->set_primary_key("id");
__PACKAGE__->add_unique_constraint("name", ["name"]);

The patch is a one word fix. ;-)

-Nilson Santos F. Jr.
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