clang-format: add HASH_ITER to ForEachMacros

.clang-format

@@ -57,6 +57,7 @@ ForEachMacros:
   - 'json_object_foreach'
   - 'json_object_foreach_safe'
   - 'json_array_foreach'
+  - 'HASH_ITER'
 IncludeBlocks: Preserve
 IndentCaseLabels: false
 IndentPPDirectives: None