fix: preserve explicit rsync option negations

src/shared/config.c

@@ -17,6 +17,7 @@ static void config_set_defaults(Config* config) {
   config->use_chunk_serialization = false;
   config->use_compression = false;
   config->use_metadata = false;
+  config->metadata_explicitly_disabled = false;
   config->show_progress = false;
   config->dry_run = false;
   config->use_delete = false;

src/shared/config.h

@@ -18,6 +18,7 @@ typedef struct Config {
   bool use_compression;
   bool use_sendfile;
   bool use_metadata;
+  bool metadata_explicitly_disabled;
   bool show_progress;
   bool dry_run;
   bool use_delete;