Undo apparent accidental @-color replaces in upstream TBA files. (#62)

I am guessing some script or tool used upstream is doing an unsafe
search-and-replace for '@' with TAB, and accidentally changing these.
They seem to have been creeping into the repo for years.

I produced this fix commit automatically with:
  sed -i 's|\t\([bcdgmnoruwyBCDGMRWY]\)|@\1|g' tba/*/*.*
...and then a few files' changes had to be undone.

I looked through all of the rest, and they look like correct fixes.

I also ran all the other letters, and they only make incorrect "fixes".

lib/world/wld/104.wld

@@ -1247,7 +1247,7 @@ from the fireplace. @n
 104 24 0 0 0 0
 E
 main chamber room taylors tays~
-   	WA small lamp sits in the center of the room letting off a small amount of
+   @WA small lamp sits in the center of the room letting off a small amount of
 light.  A beautiful white shag carpet is covering the whole floor besides in a
 small spot where there is white marble with small flecks of black in them.  
 Directly on the wall behind the marble is a large fireplace the sinks deep into
@@ -1258,7 +1258,7 @@ fireplaces frame is made of small marble bricks, all are black, making the
 fireplace standout from the rest of the room.  A window lies on the wall
 opposite the fireplace, letting in a little light through the linen curtains.  
 A large squishy looking armchair sits in the middle of the room only a few feet
-from the firplace.  	n
+from the firplace.  @n
 ~
 S
 $~