Fix StorageDeltaMerge constructor not match in gtest_manual_compact

[jiaqizho]

What problem does this PR solve?

Issue Number: close #4949

Problem Summary:

What is changed and how it works?

• rm std::ref

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CalvinNeo
• breezewish

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[breezewish]

How did CI pass :/

[CalvinNeo]

lgtm

[jiaqizho]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 41612d6

[sre-bot]

Coverage for changed files

Filename                                                                                                                Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
/home/jenkins/agent/workspace/tiflash-build-common/tiflash/dbms/src/Flash/Management/tests/gtest_manual_compact.cpp         905               315    65.19%          16                 0   100.00%         251                 4    98.41%         264               141    46.59%
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                                                                                                       905               315    65.19%          16                 0   100.00%         251                 4    98.41%         264               141    46.59%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18224      9786             46.30%    204134  97961        52.01%

full coverage report (for internal network access only)