Lower output threshold of libAfterImage

[Martin von Gagern]

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Hi!

I updated to 8.8 with libAfterImage support and got this message on the
command line where I started urxvt:
  (null) : image path is "(null)".
I traced this to a call of create_generic_imageman. Looking at the
source code of libAfterImage, I noticed that this output did not depend
on the argument, but only on some output threshold within libAI. While
giving progress informations might make sense for applications dealing
in graphics mainly, doing so seems of little use for rxvt-unicode.

The attached patch lowers the output threshold one notch, disabling
progress output while keeping warning and error messages.

Greetings,
 Martin von Gagern
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