parser: port test "top-level tuple function call type"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

parser_test.zig

@@ -1798,3 +1798,10 @@ test "zig fmt: if-else with comment before else" {
         \\
     );
 }
+
+test "zig fmt: top-level tuple function call type" {
+    try testCanonical(
+        \\foo()
+        \\
+    );
+}