Remove pretty-expanded from failing tests

This commit removes pretty-expanded from all tests that wind up calling panic!
one way or another now that its internals are unstable.

src/test/run-pass/static-function-pointer.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// pretty-expanded FIXME #23616
 
 fn f(x: isize) -> isize { x }
 fn g(x: isize) -> isize { 2 * x }