Corrected sector types in wld-files according last know good

lib/world/wld/79.wld

@@ -340,7 +340,7 @@ movement seem to extend only to the up and down directions.  Unless you
 want to let go of the secure and seemingly unmovable chain, then those are
 the directions you should take from here.
 ~
-79 4 0 0 0 0
+79 4 0 0 0 5
 D4
 Upwards, you see the chain disappearing into the clouds above.
 ~
@@ -361,7 +361,7 @@ seems like a totally impossible task.  The ascend is the only way ahead
 for you.  Otherwise you would risk death by falling to the hard ground
 below.  DO NOT DESCEND NOW OR YOU WILL SURELY DIE!!!!
 ~
-79 4 0 0 0 0
+79 4 0 0 0 5
 D4
 That way seems to be the only way away from here.
 ~
@@ -383,7 +383,7 @@ and down.  No way are you going to descend now... You've only just begun
 your climb.  Besides it could cost you your life.  Look down and you'll
 see why.
 ~
-79 4 0 0 0 0
+79 4 0 0 0 5
 D4
 There seems to be only one way from here and that's up.
 ~
@@ -405,7 +405,7 @@ originating from within the Chain *ITSELF*.  It says 'Welcome back some
 other time, stranger.  Your company is always... hmmm... interesting.  God
 Speed.'  The chain extends further down through the now spreading clouds.
 ~
-79 4 0 0 0 0
+79 4 0 0 0 5
 D4
 It seems to you that the Chain is dissolving again.  Maybe it is just an 
 illusion, but still...
@@ -426,7 +426,7 @@ you can now see the Mansion of Naris, Residence of the Greater God Redferne.
 The chain beneath you seems to evaporate in the mustering clouds that
 surround you by now.
 ~
-79 4 0 0 0 0
+79 4 0 0 0 5
 D4
 You see the sunny top of the clouds.  Beyond these, the Mansion towers before
 your eyes.  Beautiful!!