[mlir][linalg][nfc] Fix formatting for linalg.elementwise

Follow-up to #124661 to address minor formatting inconsistencies.

**Changes:**
1. Standardized test file names by using hyphens (`-`) instead of
   underscores (`_`).
2. Renamed `"round-trip.mlir"` to `"roundtrip.mlir"` for consistency
   with similar tests.
3. Normalized indentation.

For **(3)**, I ensured we follow the pre-existing formatting style
introduced with `linalg.generic`, where all new lines are indented by
**8 spaces**.  Thus, the formatting is now:

```mlir
  %r = linalg.elementwise
      kind=#linalg.elementwise_kind<sub>
      indexing_maps = [affine_map<(d0, d1) -> (d1, d0)>,
                       affine_map<(d0, d1) -> (d0, d1)>,
                       affine_map<(d0, d1) -> (d0, d1)>]
      ins(%A, %B: tensor<8x16xf32>, tensor<16x8xf32>)
      outs(%C: tensor<16x8xf32>) -> tensor<16x8xf32>
```

instead of:

```mlir
  %r = linalg.elementwise
               kind=#linalg.elementwise_kind<sub>
               indexing_maps = [affine_map<(d0, d1) -> (d1, d0)>,
                                affine_map<(d0, d1) -> (d0, d1)>,
                                affine_map<(d0, d1) -> (d0, d1)>]
               ins(%A, %B: tensor<8x16xf32>, tensor<16x8xf32>)
               outs(%C: tensor<16x8xf32>) -> tensor<16x8xf32>
```

Submitting this without a review, as these are straightforward changes,
and I want to reduce PR traffic/noise. However, please let me know if
you prefer changes like these to go through a formal PR review.
4 files changed
tree: a97f152c70d7a084211bf6f1b2b0f75d20d1ed32
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
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