Fix CI: recharacterize two tests missed in previous switch block removal

EnumSwitchAndValWithUnusedMissingTypeAsync and Issue803SelectCaseIsRelationalUsesC9PatternAsync
still expected blank lines before default: and blocks around single-statement cases, which
the #1244 fix now removes.

https://claude.ai/code/session_01AkwUvu3XuCdj3D4axoX4UX

Author: claude

Tests/CSharp/MissingSemanticModelInfo/ExpressionTests.cs

@@ -238,7 +238,6 @@ public PositionEnum PositionEnumFromString(string pS, MissingType missing)
             case ""1"":
                 tPos = (PositionEnum)1;
                 break;
-
             default:
                 Ratio = (float)Conversion.Val(pS);
                 break;
@@ -256,7 +255,6 @@ public string PositionEnumStringFromConstant(PositionEnum pS)
             case (PositionEnum)1:
                 tS = ""LEFTTOP"";
                 break;
-
             default:
                 tS = ((int)pS).ToString();
                 break;

Tests/CSharp/StatementTests/MethodStatementTests.cs

@@ -1293,18 +1293,11 @@ public int Rollo(int Breite)
         switch (Breite)
         {
             case < 1000:
-                {
-                    return 12;
-                }
+                return 12;
             case < 1200:
-                {
-                    return 15;
-                }
-
+                return 15;
             default:
-                {
-                    return 28;
-                }
+                return 28;
         }
     }
 }");