Handle sources with . in name by replacing them with _

Signed-off-by: Taylor Smock <tsmock@meta.com>

src/main/java/org/openstreetmap/josm/plugins/mapwithai/tools/MapPaintUtils.java

@@ -160,6 +160,7 @@ public final class MapPaintUtils {
             return;
         }
         List<String> sources = ds.allPrimitives().stream().map(MapPaintUtils::getSourceValue).filter(Objects::nonNull)
+                .map(s -> s.replace('.', '_'))
                 .distinct().collect(Collectors.toList());
         if (!styleSource.isLoaded()) {
             styleSource.loadStyleSource();