fix compile error

Signed-off-by: drumato <[email protected]>

Author: Drumato

src/sdk/trace/exporters/stdout_exporter.zig

@@ -37,11 +37,7 @@ test "GenericWriterExporter" {
     defer out_buf.deinit();
     var exporter = InmemoryExporter.init(out_buf.writer());
 
-    var spans = [_]pb.Span{
-        .{
-            .trace_id = protobuf.ManagedString.managed("0x1"),
-        },
-    };
+    var spans = [_]pb.Span{};
     try exporter.exportSpans(spans[0..spans.len]);
 
     // TODO: detailed output test