Move bp to-match-comments on same line for py3.13

In the `examples/debugging/restore_builtin_breakpoint.py` i had put the
pattern-comment lines on the line following the `breakpoint()` bc it
seems that's where `pdb` would always "stop" and print the line to
console? So the test would only pass by actually ensuring that in the
`pexpect` capture..

Now on 3.13 it seems that the `pdb` line halting must have been fixed;
it now renders to console the same `breakpoint()` line?
Anyway it works as you'd expect now but **only** on 3.13 so after this
change we might have to adjust the tests to `pytest.xfail()` on earlier
versions.

examples/debugging/restore_builtin_breakpoint.py

@@ -32,8 +32,7 @@ async def main() -> None:
             f'$PYTHONOBREAKPOINT: {pybp_var!r}\n'
             f'`sys.breakpointhook`: {pybp_hook!r}\n'
         )
-        breakpoint()
-        pass  # first bp, tractor hook set.
+        breakpoint()  # first bp, tractor hook set.
 
     # XXX AFTER EXIT (of actor-runtime) verify the hook is unset..
     #
@@ -43,8 +42,7 @@ async def main() -> None:
     assert sys.breakpointhook
 
     # now ensure a regular builtin pause still works
-    breakpoint()
-    pass  # last bp, stdlib hook restored
+    breakpoint()  # last bp, stdlib hook restored
 
 
 if __name__ == '__main__':