Tell clang-tidy that L is a fine name for a local pointer

.clang-tidy

@@ -54,3 +54,7 @@ CheckOptions:
     value: camelBack
   - key: readability-implicit-bool-conversion.AllowPointerConditions
     value: true
+
+  # Lua state
+  - key: readability-identifier-naming.LocalPointerIgnoredRegexp
+    value: ^L$

src/controllers/plugins/PluginController.cpp

@@ -287,7 +287,7 @@ QString PluginController::tryExecPluginCommand(const QString &commandName,
         {
             const auto &funcName = it->second;
 
-            auto *L = plugin->state_;  // NOLINT
+            auto *L = plugin->state_;
             lua_getfield(L, LUA_REGISTRYINDEX, funcName.toStdString().c_str());
             lua::push(L, ctx);