Set SCM type for metadata before filtering.

Having the proper SCM type ensures that the &filter subroutine in
expandXMLModules actually sets the repository value for our
kde-build-metadata module.

kdesrc-build

@@ -5289,6 +5289,7 @@ sub expandXMLModules
 
     if ($repositoryMetadataRequired) {
         my $repoMetadataModule = Module->new($ctx, 'kde-build-metadata');
+        $repoMetadataModule->setScmType('metadata');
 
         # Manually run this through the filter so all the right magic happens.
         ($repoMetadataModule) = &$filter($repoMetadataModule);