Global personal computer shipments face a deeper-than-expected 7.8 percent slump this year as tablets overtake laptops for the first time, according to a report from market research company IDC, Reuters reports. The firm previously had forecast a 1.3 percent decline in PC shipments for 2013 but said in a report on Tuesday that consumers content with tablets are continuing to hold off replacing ageing laptops and desktop computers. By 2015, tablets will outship not just laptops, but all PCs, according to IDC…