Fix lua.touch for the 700D (#2520) thx to @nikfreak for the awesome
Created originally on Bitbucket by dnlit (Daniel)
Was already merged in Bitbucket before import, marked as merged by the import user
Me failing to do an elegant PR. https://bitbucket.org/hudson/magic-lantern/issues/2520/lua_touch-outdated-hijack_touch_cbr_ptr is the discussion.