Fixes loadClip and proper _root resolution for child movie

Fixes loading and execution of the submovie in item 7 from archive http://swf.codeazur.com.br/#1dd4a1d513c747e4d0cb55339106da1d80a0077fb16f8a8c015e032c0b172429

avm1-moviecliploader fails since there is not delay due to second AVM1 instantiation -- disabling the test