The remains of an Arcadia Kansas soldier killed in World War II will be laid to rest in Fort Scott Wednesday.     The Defense POW/MIA Accounting Agency says the remains of 33-year-old Army Pfc. Leslie E. Shankles are being returned to his family for burial with full military honors.     Shankles remains were accounted for July 12. He was killed by enemy fire in October 1944 in Hurtgen Forest in Germany.     The agency says a l…