fix(storage): fix level score of base level

[Li0k]

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What's changed and what's your intention?

fix level score of base level. BaseLevelCompaction score must higher than IntraCompaction

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

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Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[Little-Wallace]

LGTM

[codecov]

Codecov Report

Merging #12875 (8fbdc14) into main (1f151cd) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #12875      +/-   ##
==========================================
+ Coverage   69.18%   69.22%   +0.03%     
==========================================
  Files        1490     1490              
  Lines      246047   246047              
==========================================
+ Hits       170235   170316      +81     
+ Misses      75812    75731      -81     

Flag	Coverage Δ
rust	69.22% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
.../src/hummock/compaction/selector/level_selector.rs	98.69% <100.00%> (ø)

... and 12 files with indirect coverage changes

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