fix schema upgrade script for initial deploy

If we don't have a database yet, we need to just deploy it. `install()`
just says "this is the version we already have", which we only need to
use for the existing cpanstats database until we migrate entirely into
DBIx::Class

Author: preaction

bin/cpantesters-schema

@@ -106,9 +106,11 @@ sub install {
 sub upgrade {
     my $schema = CPAN::Testers::Schema->connect_from_config;
     if ( !$schema->get_db_version() ) {
-        $schema->install( '0.000' );
+        $schema->deploy;
+    }
+    else {
+        $schema->upgrade;
     }
-    $schema->upgrade;
 }
 
 sub fetch {