windows.errors: make check-invalid-handle throw windows-error instances

There are two consequences:
- the thrown object is now a windows-error, previously it was a string;
- if GetLastError returns zero, nothing is thrown. Previously the string
"The operation completed successfully." was thrown in that case.

basis/windows/errors/errors.factor

@@ -744,7 +744,7 @@ ERROR: windows-error n string ;
     win32-error-string throw ;
 
 : check-invalid-handle ( handle -- handle )
-    dup INVALID_HANDLE_VALUE = [ throw-win32-error ] when ;
+    dup INVALID_HANDLE_VALUE = [ win32-error ] when ;
 
 CONSTANT: expected-io-errors
     ${