maint: remove template helpers orphaned by the payload removal

json_safe and maybe_store_string were reachable only through
collect_template_payload (removed in 055b256). Caught by re-running the
orphan scan after that commit rather than assuming the first pass was final.

Checked: 1 occurrence each repo-wide (grep -a), 0 refs in ComfyUI core/FunUI.
Tests: 22 failed / 460 passed, identical to baseline.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

templates.py

@@ -1005,18 +1005,8 @@ def now_iso():
     return datetime.now(timezone.utc).replace(microsecond=0).isoformat()
 
 
-def json_safe(value):
-    try:
-        return json.loads(json.dumps(value))
-    except (TypeError, ValueError):
-        return copy.deepcopy(value)
 
 
-def maybe_store_string(template, field, value, update_only):
-    if isinstance(value, str) and value.strip():
-        template[field] = value
-    elif not update_only:
-        template.pop(field, None)