[libc] [llvm] [libc] Migrate wctype_utils to use wchar_t where applicable. (PR #166234)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- libc/src/__support/wctype_utils.h libc/src/wctype/iswalpha.cpp libc/test/src/wchar/WcstolTest.h --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libc/src/wctype/iswalpha.cpp b/libc/src/wctype/iswalpha.cpp
index fa2feb9c3..e151363b8 100644
--- a/libc/src/wctype/iswalpha.cpp
+++ b/libc/src/wctype/iswalpha.cpp
@@ -15,7 +15,7 @@
 namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, iswalpha, (wint_t c)) {
-    return internal::iswalpha(static_cast<wchar_t>(c));
+  return internal::iswalpha(static_cast<wchar_t>(c));
 }
 
 } // namespace LIBC_NAMESPACE_DECL

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https://github.com/llvm/llvm-project/pull/166234