Shar-Teel/Tiax Banter Fix

CrevsDaak noted that Shar-Teel/Tiax banter X#SHTI1 makes specific
mention of the Iron Throne.  Adding a GlobalGT("Chapter","GLOBAL",3)
check to line 723 of x#sharteel.d.

http://forums.gibberlings3.net/index.php?showtopic=26415