yuzu/configure_input_player: Use std::size_t to represent the player index instead of u8

Prevents compiler warnings related to truncation when invoking the
dialog. It's also extremely suspect to use a u8 value here instead of a
more general type to begin with.

src/yuzu/configuration/configure_input_player.cpp

@@ -104,7 +104,7 @@ static QString AnalogToText(const Common::ParamPackage& param, const std::string
     }
 };
 
-ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, u8 player_index, bool debug)
+ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_index, bool debug)
     : QDialog(parent), ui(std::make_unique<Ui::ConfigureInputPlayer>()), player_index(player_index),
       debug(debug), timeout_timer(std::make_unique<QTimer>()),
       poll_timer(std::make_unique<QTimer>()) {

src/yuzu/configuration/configure_input_player.h

@@ -30,7 +30,7 @@ class ConfigureInputPlayer : public QDialog {
     Q_OBJECT
 
 public:
-    explicit ConfigureInputPlayer(QWidget* parent, u8 player_index, bool debug = false);
+    explicit ConfigureInputPlayer(QWidget* parent, std::size_t player_index, bool debug = false);
     ~ConfigureInputPlayer() override;
 
     /// Save all button configurations to settings file
@@ -62,7 +62,7 @@ private:
 
     std::unique_ptr<Ui::ConfigureInputPlayer> ui;
 
-    u8 player_index;
+    std::size_t player_index;
     bool debug;
 
     std::unique_ptr<QTimer> timeout_timer;