[libc++][chrono][test] Fixes bogus loops.

Changes the loop range to match similar tests and avoids zero
iterations. The original motivation to reduce the number of iterations
was to allow the test to be executed during constant evaluation.

Fixes: llvm#100502

Author: mordante

libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/comparisons.pass.cpp

@@ -59,8 +59,8 @@ constexpr bool test() {
                                 : std::strong_ordering::greater)));
 
   //  same month, different years
-  for (int i = 1000; i < 20; ++i)
-    for (int j = 1000; j < 20; ++j)
+  for (int i = 1000; i < 1010; ++i)
+    for (int j = 1000; j < 1010; ++j)
       assert((testOrder(year_month_day_last{year{i}, month_day_last{January}},
                         year_month_day_last{year{j}, month_day_last{January}},
                         i == j  ? std::strong_ordering::equal