DolphinQt2: Remove 'slots:' syntax from headers

With Qt5's new connection syntax, method pointers and functors are
connected directly. There's no need to declare slots.

Source/Core/DolphinQt2/GameList/GameList.h

@@ -21,13 +21,17 @@ public:
   explicit GameList(QWidget* parent = nullptr);
   QString GetSelectedGame() const;
 
-public slots:
   void SetTableView() { SetPreferredView(true); }
   void SetListView() { SetPreferredView(false); }
   void SetViewColumn(int col, bool view) { m_table->setColumnHidden(col, !view); }
   void OnColumnVisibilityToggled(const QString& row, bool visible);
 
-private slots:
+signals:
+  void GameSelected();
+  void EmulationStarted();
+  void EmulationStopped();
+
+private:
   void ShowContextMenu(const QPoint&);
   void OpenContainingFolder();
   void OpenProperties();
@@ -41,12 +45,6 @@ private slots:
   void CompressISO();
   void OnHeaderViewChanged();
 
-signals:
-  void GameSelected();
-  void EmulationStarted();
-  void EmulationStopped();
-
-private:
   void MakeTableView();
   void MakeListView();
   void MakeEmptyView();

Source/Core/DolphinQt2/GameList/GameListModel.h

@@ -41,7 +41,6 @@ public:
     NUM_COLS
   };
 
-public slots:
   void UpdateGame(QSharedPointer<GameFile> game);
   void RemoveGame(const QString& path);
 

Source/Core/DolphinQt2/GameList/GameTracker.h

@@ -29,7 +29,6 @@ public:
   explicit GameTracker(QObject* parent = nullptr);
   ~GameTracker();
 
-public slots:
   void AddDirectory(const QString& dir);
   void RemoveDirectory(const QString& dir);
 
@@ -54,7 +53,7 @@ class GameLoader final : public QObject
 {
   Q_OBJECT
 
-public slots:
+public:
   void LoadGame(const QString& path)
   {
     GameFile* game = new GameFile(path);