Fix proxy bidding

First bid needs to go into the proxy_bidding table for the system to work. Otherwise subsequent bids are treated as the first bid and the current bidder can bid against themselves and up the current bid by bidding the minimum. There is also a syntax error in the code which is fixed here. More information at http://www.webidsupport.com/forums/showthread.php?7152-User-Can-Bid-Against-Themselves&p=35583&viewfull=1#post35583