Seven catholic elementary schools in Bucks and Montgomery Counties will remain parish schools after winning appeals of a blue ribbon commission recommendation to close or consolidate.   They are Saint John the Baptist in Ottsville, Saint Michael the Archangel in Tullytown, Our Lady of Grace in Penndel, Saint Mark in Bristol, Saint Ephrem in Bensalem, Holy Trinity in Morrisville and Visitation BVM in West Norriton.   Sain John the Evangelist in Lower Makefield will close in June instead of becoming a regional school as recommended by the blue ribbon commission.   The final decision on the fate of Conwell-Egan High School in Fairless Hills is due next week.