Allow for duplicate font variation styles

[radarhere]

Resolves #9361

Within font_getvarnames(), our code goes through the names, and once the ID of a name matches the ID of a style, it breaks. It presumes that each master->namedstyle would have a unique ID.

Pillow/src/_imagingft.c

Lines 1280 to 1291 in 2ebb3e9

	if (master->namedstyle[j].strid == name.name_id) {
	list_name = Py_BuildValue("y#", name.string, name.string_len);
	if (list_name == NULL) {
	PyMem_Free(list_names_filled);
	Py_DECREF(list_names);
	FT_Done_MM_Var(library, master);
	return NULL;
	}
	PyList_SetItem(list_names, j, list_name);
	list_names_filled[j] = 1;
	break;
	}

The font found in the issue has two styles with the same ID. To allow for this, we should no longer break and continue to go through the loop. Once the list has been populated in C, Python can remove the duplicate result.

I created a test font here from our existing AdobeVFPrototype.ttf using ttx.