Add less variable @icon-color

[afc163]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

👻 What's the background?

close #15343

💡 Solution

Add less variable @icon-color.

📝 Changelog description

Describe changes from user side, and list all potential break changes or other risks.

1. English description

• Add less variable @icon-color. 定制主题能否提供默认icon的颜色变量？ #15343

2. Chinese description (optional)

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[codecov]

Codecov Report

Merging #15345 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #15345   +/-   ##
=======================================
  Coverage   94.11%   94.11%           
=======================================
  Files         250      250           
  Lines        6643     6643           
  Branches     1939     1939           
=======================================
  Hits         6252     6252           
  Misses        390      390           
  Partials        1        1

---

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #15345 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #15345   +/-   ##
=======================================
  Coverage   94.11%   94.11%           
=======================================
  Files         250      250           
  Lines        6643     6643           
  Branches     1939     1939           
=======================================
  Hits         6252     6252           
  Misses        390      390           
  Partials        1        1

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f65853b...74ea064. Read the comment docs.

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