Core/IOS/ES: Make use of fmt::format where applicable

Eliminates a deprecation warnings on macOS. While we're in the
same area, we can remove the call to GetPointer() and instead
use CopyToEmu() to copy the string data back to the emulated memory.

Source/Core/Core/IOS/ES/ES.cpp

@@ -9,6 +9,8 @@
 #include <utility>
 #include <vector>
 
+#include <fmt/format.h>
+
 #include "Common/ChunkFile.h"
 #include "Common/EnumUtils.h"
 #include "Common/Logging/Log.h"
@@ -218,11 +220,12 @@ IPCReply ESDevice::GetTitleDirectory(const IOCtlVRequest& request)
   auto& memory = system.GetMemory();
 
   const u64 title_id = memory.Read_U64(request.in_vectors[0].address);
-
-  char* path = reinterpret_cast<char*>(memory.GetPointer(request.io_vectors[0].address));
-  sprintf(path, "/title/%08x/%08x/data", static_cast<u32>(title_id >> 32),
+  const auto path = fmt::format("/title/{:08x}/{:08x}/data", static_cast<u32>(title_id >> 32),
                                 static_cast<u32>(title_id));
 
+  const auto path_dst = request.io_vectors[0].address;
+  memory.CopyToEmu(path_dst, path.data(), path.size());
+
   INFO_LOG_FMT(IOS_ES, "IOCTL_ES_GETTITLEDIR: {}", path);
   return IPCReply(IPC_SUCCESS);
 }