DolphinQt: Expose Game Boy Player ROM path on the GameCube config tab.

Source/Core/DolphinQt/Settings/GameCubePane.h

@@ -85,8 +85,8 @@ private:
   ConfigBool* m_gba_save_rom_path;
   QPushButton* m_gba_browse_bios;
   ConfigUserPath* m_gba_bios_edit;
-  std::array<QPushButton*, 4> m_gba_browse_roms;
-  std::array<ConfigText*, 4> m_gba_rom_edits;
+  std::array<QPushButton*, 5> m_gba_browse_roms;
+  std::array<ConfigText*, 5> m_gba_rom_edits;
   QPushButton* m_gba_browse_saves;
   ConfigUserPath* m_gba_saves_edit;
 };