[webgpu] Fix `GatherBlockQuantized` on Intel ADL/TGL platforms (#26526)
### Description
The `GatherBlockQuantized` operation was using incorrect `data_indices`
during execution on Intel Alder Lake (ADL) and Tiger Lake (TGL)
platforms.
This change sets the proper `data_indices`, resolving correctness issues
encountered with the Phi-4-mini model on these architectures.
### Motivation and Context
See above.