Spurious ~n in failure message

[rlipscombe]

Introduced between v0.4.2 and v0.4.3.

Both tests are just ?assert(false).

v0.4.3

 1) without_vars/0 (test/foo_tests.erl:106)
    Assert failed: false

 2) with_vars/0 (test/foo_tests.erl:111)
    Assert failed: false~n
1 test passed  2 tests failed  (0.41 s)

Note the extra ~n and the missing blank line.

v0.4.2

 1) without_vars/0 (test/foo_tests.erl:106)
    Assert failed: false

 2) with_vars/0 (test/foo_tests.erl:111)
    Assert failed: false

1 test passed  2 tests failed  (0.41 s)