Support Logging Transcript for non-Sandboxed app

NSURLBookmarkCreationWithSecurityScope doesn't seemed to work for
non-sandboxed application, when try to use it, I got:

4/13/13 9:17:42.208 PM ScopedBookmarkAgent[85708]: Failed to retrieve
app-scope key, aborting.

in my Console.

For non-sandboxed app we can simply store the transcript folder path
instead of bookmark to workaround that.
Fix a warning for trial build
Make sure input text field font is set correctly initially

Otherwise it will only be set when the first textDidChange: happens.