Expect correct result for CSS random with step of infinity

The spec states that "In random(A, B, C)... If C is infinite, the result
is A." however this test previously expected the result to be NaN, the
same as if B was infinite.

Author: Calme1709

css/css-values/random-computed.tentative.html

@@ -245,8 +245,8 @@
 test_random_computed_value(property, 'calc(10 + random(10, infinity))', '0');
 test_random_computed_value(property, 'calc(10 + random(10, infinity, 10))', '0');
 test_random_computed_value(property, 'calc(10 + random(10, infinity, infinity))', '0');
-test_random_computed_value(property, 'random(10, 100, infinity)', '0');
-test_random_computed_value(property, 'calc(10 + random(10, 100, infinity))', '0');
+test_random_computed_value(property, 'random(10, 100, infinity)', '10');
+test_random_computed_value(property, 'calc(10 + random(10, 100, infinity))', '20');
 // Negative steps, even infinitely negative steps, are ignored.
 test_random_computed_value_in_range(property, 'random(10, 100, -infinity)', '10', '100');
 test_random_computed_value_in_range(property, 'calc(10 + random(10, 100, -infinity))', '20', '110');