Fix unused parameter warning/error in parquet/page_data.cu

[davidwendt]

Description

Fixed unused parameters warning/error in the parquet/page_data.cu:

/cudf/cpp/src/io/parquet/page_data.cu(171): error #177-D: parameter "is_decode_step" was declared but never referenced
          detected during:
            instantiation of "__nv_bool cudf::io::parquet::gpu::<unnamed>::setupLocalPageInfo(cudf::io::parquet::gpu::<unnamed>::page_state_s *, const cudf::io::parquet::gpu::PageInfo *, cudf::device_span<const cudf::io::parquet::gpu::ColumnChunkDesc, 18446744073709551615UL>, size_t, size_t, __nv_bool, cudf::io::parquet::gpu::rle_stream<level_t> *) [with level_t=uint8_t]" 
(1825): here
            instantiation of "void cudf::io::parquet::gpu::<unnamed>::gpuComputePageSizes<lvl_buf_size,level_t>(cudf::io::parquet::gpu::PageInfo *, cudf::device_span<const cudf::io::parquet::gpu::ColumnChunkDesc, 18446744073709551615UL>, size_t, size_t, __nv_bool, __nv_bool) [with lvl_buf_size=2048, level_t=uint8_t]" 
(2197): here

/cudf/cpp/src/io/parquet/page_data.cu(172): error #177-D: parameter "decoders" was declared but never referenced
          detected during:
            instantiation of "__nv_bool cudf::io::parquet::gpu::<unnamed>::setupLocalPageInfo(cudf::io::parquet::gpu::<unnamed>::page_state_s *, const cudf::io::parquet::gpu::PageInfo *, cudf::device_span<const cudf::io::parquet::gpu::ColumnChunkDesc, 18446744073709551615UL>, size_t, size_t, __nv_bool, cudf::io::parquet::gpu::rle_stream<level_t> *) [with level_t=uint8_t]" 
(1825): here
            instantiation of "void cudf::io::parquet::gpu::<unnamed>::gpuComputePageSizes<lvl_buf_size,level_t>(cudf::io::parquet::gpu::PageInfo *, cudf::device_span<const cudf::io::parquet::gpu::ColumnChunkDesc, 18446744073709551615UL>, size_t, size_t, __nv_bool, __nv_bool) [with lvl_buf_size=2048, level_t=uint8_t]" 
(2197): here

2 errors detected in the compilation of "/cudf/cpp/src/io/parquet/page_data.cu".

Removing the parameters seemed to work and gtests are passing.
This was found by building with nvcc 11.5.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[nvdbaranec]

Detritus from some optimization experiments. Thanks for the fix.

[vuule]

/merge