fix: resolve device mismatch in T5TextEmbedder

[mr-asa]

Description

Fix device mismatch error in T5TextEmbedder class that was causing "Expected all tensors to be on the same device" error.

Changes

• Add explicit device management for tensors and model
• Fix CUDA/CPU device mismatch error in forward pass
• Improve tensor device handling reliability

Problem

The T5TextEmbedder class was experiencing device mismatch errors when tensors were inadvertently placed on different devices (CUDA and CPU).

Solution

Modified the T5TextEmbedder class to ensure all tensors and the model are explicitly moved to the correct device before operations.

[iwr-redmond]

Hello @mr-asa. Thank you for your excellent PR.

In the absence of @JettHu and colleagues, you may wish to rename your fork (e.g. "comfyui_jankella") and publish it to the ComfyUI Registry so that everyone in the community can benefit from this essential update.