[libc++][ranges][NFC] Remove extraneous cleanup checks.

[var-const]

Summary

There is no need to check the counters on Counted after destroying
elements in the range because these tests are not testing destroy.

[• Quuxplusone]

Seems harmless to keep, but also harmless to remove. :)

[ldionne]

In D115839#3196413, @Quuxplusone wrote:

Seems harmless to keep, but also harmless to remove. :)

I requested that in another review. IMO it's better to remove cause it removes the possibility for confusion around what we're trying to test.

[ldionne]

Note that the only CI failures are on Windows and they look infra-related. Feel free to ship this.

libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/ranges_uninitialized_default_construct.pass.cpp

// A range containing several objects, (iter, sentinel) overload.
     constexpr int N = 5;
     Buffer<Counted, 5> buf;
 
     std::ranges::uninitialized_default_construct(buf.begin(), buf.end());
     assert(Counted::current_objects == N);
     assert(Counted::total_objects == N);
 
     std::destroy(buf.begin(), buf.end());
-    assert(Counted::current_objects == 0);
-    assert(Counted::total_objects == N);
     Counted::reset();
   }
 
   // A range containing several objects, (range) overload.
   {
     constexpr int N = 5;
     Buffer<Counted, N> buf;
 
     auto range = std::ranges::subrange(buf.begin(), buf.end());
     std::ranges::uninitialized_default_construct(range);
     assert(Counted::current_objects == N);
     assert(Counted::total_objects == N);
 
     std::destroy(buf.begin(), buf.end());
-    assert(Counted::current_objects == 0);
-    assert(Counted::total_objects == N);
     Counted::reset();
   }
 
   // Using `counted_iterator`.
   {
     constexpr int N = 3;
     Buffer<Counted, 5> buf;
 

libcxx/test/std/utilities/memory/specialized.algorithms/uninitialized.construct.default/ranges_uninitialized_default_construct_n.pass.cpp

// A range containing several objects.
     constexpr int N = 5;
     Buffer<Counted, N> buf;
 
     std::ranges::uninitialized_default_construct_n(buf.begin(), N);
     assert(Counted::current_objects == N);
     assert(Counted::total_objects == N);
 
     std::destroy(buf.begin(), buf.end());
-    assert(Counted::current_objects == 0);
-    assert(Counted::total_objects == N);
     Counted::reset();
   }
 
   // An exception is thrown while objects are being created -- the existing objects should stay
   // valid.
 #ifndef TEST_HAS_NO_EXCEPTIONS
   {
     constexpr int N = 5;