Set scopa targets to their traditional defaults

Partnership games go to 21: scopone scientifico (the tournament target)
and scopa a quattro, while two-player scopa keeps its usual 11. The scopa
package resolves the default from the player count and exposes a per
variant options_schema default, so the lobby creation form shows the
right value without frontend changes.

server/tests/test_routes_games.py

@@ -316,6 +316,10 @@ class GameTypesRouteTest(unittest.TestCase):
         self.assertEqual(4, scopone["min_players"])
         self.assertEqual(4, scopone["max_players"])
         self.assertIn("target_score", scopone["options_schema"]["properties"])
+        self.assertEqual(
+            21,
+            scopone["options_schema"]["properties"]["target_score"]["default"],
+        )
         self.assertIn("napola", scopone["options_schema"]["properties"])
         self.assertIn(
             "asso_pigliatutto", scopone["options_schema"]["properties"]
@@ -326,6 +330,9 @@ class GameTypesRouteTest(unittest.TestCase):
         self.assertEqual(2, scopa["min_players"])
         self.assertEqual(2, scopa["max_players"])
         self.assertIn("target_score", scopa["options_schema"]["properties"])
+        self.assertEqual(
+            11, scopa["options_schema"]["properties"]["target_score"]["default"]
+        )
         self.assertIn(
             "asso_pigliatutto", scopa["options_schema"]["properties"]
         )
@@ -337,6 +344,12 @@ class GameTypesRouteTest(unittest.TestCase):
         self.assertIn(
             "target_score", scopa_quattro["options_schema"]["properties"]
         )
+        self.assertEqual(
+            21,
+            scopa_quattro["options_schema"]["properties"]["target_score"][
+                "default"
+            ],
+        )
         self.assertIn(
             "asso_pigliatutto", scopa_quattro["options_schema"]["properties"]
         )