Fix for House of Death on Oric.

There is a missing exit description in room 50, the crypt. The rooms are defined by data statements which list exit noun, followed by room number. All of these seem intact but the exits for room 50, defined at the end of line 1880:
1880 DATA4,46,1,51,53,46,0,1,49,54,49,0,1,52,2,48,54,52,0,51,3,53,0 

The fix for this is to add a 4 (noun for west) between the 0 and 51:
1880 DATA4,46,1,51,53,46,0,1,49,54,49,0,1,52,2,48,54,52,0,4,51,3,53,0