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/211.wld

@@ -66,11 +66,11 @@ flowerbeds.
 ~
 E
 sign brass bright~
-   	w
-	w       Sibyl, Esmerelda and Jaelle  
-	w
-	w              Tarot Readings           
-	n
+   @w
+@w       Sibyl, Esmerelda and Jaelle  
+@w
+@w              Tarot Readings           
+@n
 ~
 S
 #21102