fixed op_image_path() doesn't return plugin's image path correctly (fixes #1116)
fixed op_image_path() doesn't return plugin's image path correctly (fixes #1116)

nise-nabe/ppcon-sns,openpne/OpenPNE3,ShinichiU/OpenPNE3,openpne/OpenPNE3,isaosano/OpenPNE3,ShinichiU/AuthFramework,ShinichiU/AuthFramework,kashiwasan/symfony-advanced,tejima/testravis,C-nakajima/OpenPNE3,tejima/testravis,balibali/KakiageSNS,openpne/OpenPNE3,ShinichiU/OpenPNE3,tejima/testravis,tejima/OP3PKG,upsilon/travis-test,nise-nabe/ppcon-sns,nishizoe/OpenPNE3,C-nakajima/OpenPNE3,upsilon/OpenPNE3,isaosano/OpenPNE3,upsilon/travis-test,isaosano/OpenPNE3,ShinichiU/AuthFramework,openpne/OpenPNE3,ShinichiU/OpenPNE3,nishizoe/OpenPNE3,upsilon/OpenPNE3,kashiwasan/symfony-advanced,isaosano/OpenPNE3,C-nakajima/OpenPNE3,balibali/KakiageSNS,ShinichiU/OpenPNE3,tejima/OP3PKG,C-nakajima/OpenPNE3