fix catch_panic.stderr

Author: RalfJung

tests/run-pass/catch_panic.stderr

@@ -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!