ENH: replace keyType with wordRe for matching selectors.

- The keyType is primarily used within dictionary reading, whereas
  wordRe and wordRes are used for selectors in code.
  Unifying on wordRe and wordRes reduces the number matching options.

src/OpenFOAM/db/dynamicLibrary/codedBase/codedBase.C

@@ -59,11 +59,9 @@ static inline void writeEntryIfPresent
 )
 {
     const entry* eptr = dict.findEntry(key, keyType::LITERAL);
-
     if (eptr)
     {
         const tokenList& toks = eptr->stream();
-
         if (!toks.empty())
         {
             os.writeEntry(key, toks[0]);