tests: Use a different rate in a segment test.
Using a rate of 1.1 in the test is causing the test to fail on 32-bit because ceil(1.1 * 10) can round to 12. Instead use a rate 2.0 that can be expressed as floating point number and doesn't trigger the problem. https://bugzilla.gnome.org/show_bug.cgi?id=797154
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