[MRG] update kreport proportion for better resolution; match other tool outputs

[bluegenes]

Fixes #2330

multiply kreport proportion * 100:

• becomes percent with 2 decimal points of resolution (e.g. 0.91 --> 91.08)
• matches output from other tools

[bluegenes]

@ctb @sourmash-bio/devs should be ready for review

[codecov]

Codecov Report

Merging #2331 (1d7fb04) into latest (5d15e86) will increase coverage by 8.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           latest    #2331      +/-   ##
==========================================
+ Coverage   84.09%   92.14%   +8.05%     
==========================================
  Files         129      100      -29     
  Lines       14950    11421    -3529     
  Branches     2191     2191              
==========================================
- Hits        12572    10524    -2048     
+ Misses       2083      602    -1481     
  Partials      295      295              

Flag	Coverage Δ
python	92.14% <100.00%> (+<0.01%)	⬆️
rust	?

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Impacted Files	Coverage Δ
src/sourmash/tax/tax_utils.py	98.32% <100.00%> (+<0.01%)	⬆️
src/core/src/ffi/hyperloglog.rs
src/core/src/sketch/hyperloglog/estimators.rs
src/core/src/ffi/utils.rs
src/core/src/sketch/hyperloglog/mod.rs
src/core/src/index/sbt/mhbt.rs
src/core/src/ffi/mod.rs
src/core/src/ffi/index/mod.rs
src/core/tests/minhash.rs
src/core/src/cmd.rs
... and 20 more

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