Fix type annotations for idlflags and _dispimpl_.

[junkmd]

The originator of this project left the following comment:

comtypes/comtypes/client/_events.py

Line 258 in 44aafcb

# Can dispid be at a different index? Should check code generator...

As seen in the refactored current codebase, dispid is only assigned at index 0 of idlflags.

• ComMethodGenerator
  

  comtypes/comtypes/tools/codegenerator/helpers.py

  Lines 117 to 127 in 01b6fc0

  	def _get_common_elms(self) -> Tuple[List[_IdlFlagType], str, str]:
  	idlflags: List[_IdlFlagType] = []
  	if self._isdual:
  	idlflags.append(dispid(self._m.memid))
  	idlflags.extend(self._m.idlflags)
  	else: # We don't include the dispid for non-dispatch COM interfaces
  	idlflags.extend(self._m.idlflags)
  	if __debug__ and self._m.doc:
  	idlflags.insert(1, helpstring(self._m.doc))
  	type_name = self._to_type_name(self._m.returns)
  	return (idlflags, type_name, self._m.name)

• DispMethodGenerator
  

  comtypes/comtypes/tools/codegenerator/helpers.py

  Lines 224 to 231 in 01b6fc0

  	def _get_common_elms(self) -> Tuple[List[_IdlFlagType], str, str]:
  	idlflags: List[_IdlFlagType] = []
  	idlflags.append(dispid(self._m.dispid))
  	idlflags.extend(self._m.idlflags)
  	if __debug__ and self._m.doc:
  	idlflags.insert(1, helpstring(self._m.doc))
  	type_name = self._to_type_name(self._m.returns)
  	return (idlflags, type_name, self._m.name)

If there is a case where this is not true (i.e., where the newly added assert isinstance(dispid, comtypes.dispid) fails), it would be an undiscovered bug.