[dexter] Update failing regression test

Commit 7deb970ef added REQUIRES and UNSUPPORTED lines to a test which is
sensitive to line number changes. Update the line number reference in the test.

GitOrigin-RevId: 40df6bac9c5c93f96181c51bbea99af5b1c5fc53
diff --git a/dexter/feature_tests/subtools/test/label_another_line.cpp b/dexter/feature_tests/subtools/test/label_another_line.cpp
index 3067617..3e0f2a8 100644
--- a/dexter/feature_tests/subtools/test/label_another_line.cpp
+++ b/dexter/feature_tests/subtools/test/label_another_line.cpp
@@ -13,5 +13,5 @@
   return result;
 }
 
-// DexLabel('test', on_line=10)
+// DexLabel('test', on_line=13)
 // DexExpectWatchValue('result', '0', on_line='test')