Unset havebeam when shift-targetting.

This was causing moves.choseRay to be overwritten, meaning shift-targetting failed after having targetted any cell.

Reported by N78291.

Created by  Robert Vollmert  on October 25, 2009
TH2A7RF5GW3PI4H22D4ZJRDLPGS43YB4FRS5RPQFBRMZGH567WQQC
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