SoundPlayer: Don't offset the seek bar with the last seek value

The audio loader plugins already do this internally, if we do this a
second time the seek bar will just end up getting rendered at the wrong
place.

Userland/Applications/SoundPlayer/PlaybackManager.cpp

@@ -38,7 +38,6 @@ void PlaybackManager::stop()
 {
     set_paused(true);
     m_connection->async_clear_buffer();
-    m_last_seek = 0;
 
     if (m_loader)
         (void)m_loader->reset();
@@ -59,7 +58,6 @@ void PlaybackManager::seek(int const position)
     if (!m_loader)
         return;
 
-    m_last_seek = position;
     bool paused_state = m_paused;
     set_paused(true);
 

Userland/Applications/SoundPlayer/PlaybackManager.h

@@ -31,7 +31,6 @@ public:
     RefPtr<Audio::Loader> loader() const { return m_loader; }
     size_t device_sample_rate() const { return m_device_sample_rate; }
 
-    int last_seek() const { return m_last_seek; }
     bool is_paused() const { return m_paused; }
     float total_length() const { return m_total_length; }
     FixedArray<Audio::Sample> const& current_buffer() const { return m_current_buffer; }
@@ -50,7 +49,6 @@ private:
 
     bool m_paused { true };
     bool m_loop = { false };
-    size_t m_last_seek { 0 };
     float m_total_length { 0 };
     size_t m_device_sample_rate { 44100 };
     size_t m_device_samples_per_buffer { 0 };

Userland/Applications/SoundPlayer/Player.cpp

@@ -18,7 +18,6 @@ Player::Player(Audio::ConnectionToServer& audio_client_connection)
         auto sample_rate = m_playback_manager.loader()->sample_rate();
         float source_to_dest_ratio = static_cast<float>(sample_rate) / m_playback_manager.device_sample_rate();
         samples_played *= source_to_dest_ratio;
-        samples_played += m_playback_manager.last_seek();
 
         auto played_seconds = samples_played / sample_rate;
         time_elapsed(played_seconds);