fix(DB/Creature): Correct TBC boss gold rewards.

[heyitsbench]

Changes Proposed:

This PR proposes changes to:

• Database (i.e. creatures).

Issues Addressed:

• Progresses [TBC Progression] World Boss and Raid Bosses drops wrong amount of gold chromiecraft/chromiecraft#7019.

SOURCE:

The changes have been validated through:

• Live research (checked on live servers, e.g Classic WotLK, Retail, etc.)
• Sniffs
• Video evidence, knowledge databases or other public sources (e.g forums, Wowhead, etc.)

Tests Performed:

This PR:

• Does not require in-game testing.

How to Test AzerothCore PRs

When a PR is ready to be tested, it will be marked as [WAITING TO BE TESTED].

You can help by testing PRs and writing your feedback here on the PR's page on GitHub. Follow the instructions here:

http://www.azerothcore.org/wiki/How-to-test-a-PR

REMEMBER: when testing a PR that changes something generic (i.e. a part of code that handles more than one specific thing), the tester should not only check that the PR does its job (e.g. fixing spell XXX) but especially check that the PR does not cause any regression (i.e. introducing new bugs).

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.

[heyitsbench]

If anyone would like to see what name these creatures have or what they drop on current master, you can check this commit.