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Fix Jebel Barkal giant.

Description

Fix Jebel Barkal giant.

Adjusts the jb.js to not try and place walls outside of the map.
Only adds really added walls to the entity list (refs. #5919).

Patch by: @elexis
Differential revision: D3299
Tested by: @Freagarach, @Stan
Fixes: #5177
Refs. #5150