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/obj/12.obj

@@ -9,7 +9,7 @@ A list of the staff's emails has been left here.~
 T 1205
 E
 list email staff~
-   	RHELP CONTACT	n for the most recent listing or:
+   @RHELP CONTACT@n for the most recent listing or:
 ~
 #1201
 pamphlet trigedit~