Tidy up clippy config.

[waywardmonkeys]

• Checking cfg_attr is no longer necessary.
• Don't need multiple clippy:: prefixes on a name.

[codecov-commenter]

Codecov Report

Merging #1547 (ac95061) into main (f9c3947) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1547      +/-   ##
==========================================
- Coverage   93.95%   93.94%   -0.01%     
==========================================
  Files         249      249              
  Lines       46060    46060              
==========================================
- Hits        43275    43273       -2     
- Misses       2785     2787       +2     

Impacted Files	Coverage Δ
src/core/inverted_index_reader.rs	72.86% <ø> (ø)
src/indexer/delete_queue.rs	94.76% <ø> (ø)
src/postings/mod.rs	98.57% <ø> (ø)
src/termdict/sstable_termdict/streamer.rs	100.00% <ø> (ø)
src/termdict/sstable_termdict/termdict.rs	74.46% <ø> (ø)
src/directory/mmap_directory.rs	90.37% <0.00%> (-0.54%)	⬇️
src/fastfield/multivalued/mod.rs	98.41% <0.00%> (-0.40%)	⬇️
src/query/boolean_query/block_wand.rs	96.85% <0.00%> (-0.21%)	⬇️
src/postings/stacker/expull.rs	99.05% <0.00%> (+0.47%)	⬆️
src/store/index/mod.rs	98.37% <0.00%> (+0.54%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.