Fix some warnings and unused includes

Author: jemoreira

base/cvd/cuttlefish/host/libs/screen_connector/ring_buffer_manager.h

@@ -16,6 +16,7 @@
 
 #pragma once
 
+#include <atomic>
 #include <map>
 
 #include "common/libs/fs/shared_fd.h"
@@ -81,4 +82,4 @@ class DisplayRingBufferManager {
  display_buffer_cache_;
 };
 
-} // namespace cuttlefish
+} // namespace cuttlefish

base/cvd/cuttlefish/host/libs/screen_connector/screen_connector.h

@@ -18,20 +18,16 @@
 
 #include <cstdint>
 #include <functional>
-#include <memory>
 #include <mutex>
-#include <optional>
 #include <string>
 #include <string_view>
-#include <thread>
 #include <type_traits>
 #include <unordered_set>
 
 #include <android-base/logging.h>
 #include <fruit/fruit.h>
 
 #include "common/libs/confui/confui.h"
-#include "common/libs/fs/shared_fd.h"
 #include "common/libs/utils/contains.h"
 #include "common/libs/utils/size_utils.h"
 #include "host/libs/config/config_constants.h"