fix(Scripts/Karazhan): Allow portal color effects to overlap on players.

[heyitsbench]

Changes Proposed:

This PR proposes changes to:

• [X] Scripts (boss scripts).

Issues Addressed:

• Closes unreported issue.

SOURCE:

The changes have been validated through:

• [X] Live research (checked on live servers, i.e. Classic WotLK)
• [X] Video evidence, knowledge databases or other public sources (e.g forums, Wowhead, etc.)
  • Wrath Classic Death Knight solo

Tests Performed:

This PR:

• [X] Has not been tested.

Known Issues and TODO List:

• [ ] Because of https://github.com/chromiecraft/chromiecraft/issues/6510, this PR is difficult to test.

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For example: if a PR fixes spell X by changing a part of code that handles spells X, Y, and Z, we should not only test X, but we should test Y and Z as well.