Remove excessive timeout on test_wait_exception for FreeBSD

This should now be fixed by the previous commit.

test/ruby/test_process.rb

@@ -1548,7 +1548,6 @@ class TestProcess < Test::Unit::TestCase
       end
       t1 = Time.now
       diff = t1 - t0
-      sec *= 3 if RUBY_PLATFORM =~ /freebsd/
       assert_operator(diff, :<, sec,
                   ->{"#{bug11340}: #{diff} seconds to interrupt Process.wait"})
       f.puts