UICommon/ResourcePack: Make TEXTURE_PATH a regular array

Same behavior, only it doesn't unnecessarily store a pointer in the
executable. While we're at it, make it constexpr and move it into the
namespace.

Source/Core/UICommon/ResourcePack/ResourcePack.cpp

@@ -15,10 +15,10 @@
 #include "UICommon/ResourcePack/Manager.h"
 #include "UICommon/ResourcePack/Manifest.h"
 
-static const char* TEXTURE_PATH = "Load/Textures/";
-
 namespace ResourcePack
 {
+constexpr char TEXTURE_PATH[] = "Load/Textures/";
+
 // Since minzip doesn't provide a way to unzip a file of a length > 65535, we have to implement
 // this ourselves
 static bool ReadCurrentFileUnlimited(unzFile file, std::vector<char>& destination)