Fix import typo in IDEPlaygroundEditor+XVim.m
Fix import typo in IDEPlaygroundEditor+XVim.m

Project fails to build due to typo on
case-sensitive filesystems

brucehappy/XVim,hyperspacemark/XVim,ishkawa/XVim,gecko655/XVim,brucehappy/XVim,pebble8888/XVim,N4tr0n/XVim,N4tr0n/XVim,antmd/XVim,pebble8888/XVim,XVimProject/XVim,dengcqw/XVim_x,hyperspacemark/XVim,antmd/XVim,XVimProject/XVim,hyperspacemark/XVim,XVimProject/XVim,teemobean/XVim,ishkawa/XVim,dengcqw/XVim_x,teemobean/XVim,XVimProject/XVim,N4tr0n/XVim,dengcqw/XVim_x,dengcqw/XVim_x,tanxxjun321/XVim,antmd/XVim,brucehappy/XVim,tanxxjun321/XVim,gecko655/XVim,pebble8888/XVim,pebble8888/XVim,antmd/XVim,N4tr0n/XVim,teemobean/XVim,tanxxjun321/XVim,teemobean/XVim,ishkawa/XVim,ishkawa/XVim,gecko655/XVim,brucehappy/XVim,gecko655/XVim,hyperspacemark/XVim,tanxxjun321/XVim