Fix range of unparenthesized tuple subject in match statement (#8101)

## Summary

This was just a bug in the parser ranges, probably since it was
initially implemented. Given `match n % 3, n % 5: ...`, the "subject"
(i.e., the tuple of two binary operators) was using the entire range of
the `match` statement.

Closes https://github.com/astral-sh/ruff/issues/8091.

## Test Plan

`cargo test`

crates/ruff_python_parser/src/parser.rs

@@ -1136,6 +1136,15 @@ match x:
 match x:
     case (0,):
         y = 0
+match x,:
+    case z:
+        pass
+match x, y:
+    case z:
+        pass
+match x, y,:
+    case z:
+        pass
 "#,
             "<test>",
         )