Fixes augment 1152: DEF +10

[lefneer311]

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What does this pull request do?

Fixes augment 1152 to match the in-client dat (+10 per step).

Modifies multiplier from 0 to 10, and reduces value from 10 to 1. Results in +10 steps tested and verified.

Steps to test these changes

Use !additem 26496 1 1152 1

Equip the shield and notice you receive +21 defense (augment +20, 1 base)