templater: drop bool support from evalastype()

Future patches will split evalastype() into two functions, evalrawexp()
and unwrapastype(), so we can catch the exception of type conversion.

  # evaluating function may bubble up inner ParseError
  thing = evalrawexp(context, mapping, arg)
  try:
      return unwrapastype(context, thing)
  except ParseError:
      # add hint and reraise

However, evalboolean() can't be factored out in this way since it has to
process boolean-like symbols as non keyword. Fortunately, it's unlikely
that we'll need a general type converter supporting bool, so this patch
drops it from the table.

mercurial/templateutil.py

@@ -333,7 +333,6 b' def evalstringliteral(context, mapping, '
     return stringify(thing)
 
 _evalfuncbytype = {
-    bool: evalboolean,
     bytes: evalstring,
     int: evalinteger,
 }