message: fix catch_panic.stderr
diff: @@ -6,10 +6,10 @@ thread 'main' panicked at 'Hello from panic: 2', $DIR/catch_panic.rs:49:20
  Caught panic message (String): Hello from panic: 2
  thread 'main' panicked at 'Box<Any>', $DIR/catch_panic.rs:50:21
  Failed get caught panic message.
  -thread 'main' panicked at 'Hello from panic: core', tests/run-pass/catch_panic.rs:52:21
  +thread 'main' panicked at 'Hello from panic: core', $DIR/catch_panic.rs:52:21
  Caught panic message (String): Hello from panic: core
  -thread 'main' panicked at 'Hello from panic: 5', tests/run-pass/catch_panic.rs:53:20
  +thread 'main' panicked at 'Hello from panic: 5', $DIR/catch_panic.rs:53:20
  Caught panic message (String): Hello from panic: 5
  -thread 'main' panicked at 'Hello from panic: 6', tests/run-pass/catch_panic.rs:54:20
  +thread 'main' panicked at 'Hello from panic: 6', $DIR/catch_panic.rs:54:20
  Caught panic message (String): Hello from panic: 6
  Success!
  