Don't apply max_form_parts to non-multipart forms

This matches Flask's (Werkzeug's) behaviour. This is applicable as url
encoded forms are quick to parse and the number of parts is therefore
not something that needs restricting.

src/quart/formparser.py

@@ -113,14 +113,10 @@ async def _parse_urlencoded(
         content_length: int | None,
         options: dict[str, str],
     ) -> tuple[MultiDict, MultiDict]:
-        try:
-            form = parse_qsl(
-                (await body).decode(),
-                keep_blank_values=True,
-                max_num_fields=self.max_form_parts,
-            )
-        except ValueError:
-            raise RequestEntityTooLarge() from None
+        form = parse_qsl(
+            (await body).decode(),
+            keep_blank_values=True,
+        )
         return self.cls(form), self.cls()
 
     parse_functions: dict[str, ParserFunc] = {

tests/test_formparser.py

@@ -3,7 +3,6 @@
 import pytest
 from werkzeug.exceptions import RequestEntityTooLarge
 
-from quart.formparser import FormDataParser
 from quart.formparser import MultiPartParser
 from quart.wrappers.request import Body
 
@@ -20,12 +19,3 @@ async def test_multipart_max_form_memory_size() -> None:
 
     with pytest.raises(RequestEntityTooLarge):
         await parser.parse(body, b"bound", 0)
-
-
-async def test_formparser_max_num_parts() -> None:
-    parser = FormDataParser(max_form_parts=1)
-    body = Body(None, None)
-    body.set_result(b"param1=data1&param2=data2&param3=data3")
-
-    with pytest.raises(RequestEntityTooLarge):
-        await parser.parse(body, "application/x-url-encoded", None)