tilepick.cc: fix compile error caused by misspelling

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Created by  Steven Noonan  on October 17, 2009
SC4YPWA67JT6NNOTYPW5LKVLZI7A5QA744UFONK5LPY5CIWZWVOQC
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