DolphinQt: Add way to override "ResourcePack" folder that controls the location of resource packs

Source/Core/UICommon/ResourcePack/ResourcePack.cpp

@@ -8,6 +8,7 @@
 
 #include <minizip/unzip.h>
 
+#include "Common/CommonPaths.h"
 #include "Common/FileSearch.h"
 #include "Common/FileUtil.h"
 #include "Common/MinizipUtil.h"
@@ -19,7 +20,7 @@
 
 namespace ResourcePack
 {
-constexpr char TEXTURE_PATH[] = "Load/Textures/";
+constexpr char TEXTURE_PATH[] = HIRES_TEXTURES_DIR DIR_SEP;
 
 ResourcePack::ResourcePack(const std::string& path) : m_path(path)
 {