test(options): Avoid % format expansion in control mode test

why: tmux control mode interprets % as format expansion, causing
"parse error: syntax error" when testing status-right with %H:%M.
what:
- Change test value from %H:%M to HH:MM for session_status_right
- Add comment explaining control mode format expansion issue

Author: tony

tests/test_options.py

@@ -927,7 +927,12 @@ class OptionTestCase(t.NamedTuple):
         "session_status_left", "status-left", OptionScope.Session, "[#S]", str
     ),
     OptionTestCase(
-        "session_status_right", "status-right", OptionScope.Session, "%H:%M", str
+        # Note: Using static value to avoid control mode % format expansion issue
+        "session_status_right",
+        "status-right",
+        OptionScope.Session,
+        "HH:MM",
+        str,
     ),
 ]