Cosmetic improvements to src/user/ source files.

PiperOrigin-RevId: 737930914
Change-Id: I1cc254d420fcdf0c42ec3d2f601e5a02d925d958

src/user/user_cache.cc

@@ -172,8 +172,8 @@ std::size_t mjCCache::MaxSize() const {
 
 
 std::size_t mjCCache::Size() const {
-    std::lock_guard<std::mutex> lock(mutex_);
-    return size_;
+  std::lock_guard<std::mutex> lock(mutex_);
+  return size_;
 }
 
 
@@ -183,7 +183,7 @@ void mjCCache::DeleteAsset(const std::string& id) {
   std::lock_guard<std::mutex> lock(mutex_);
   auto it = lookup_.find(id);
   if (it != lookup_.end()) {
-     Delete(&(it->second));
+    Delete(&(it->second));
   }
 }
 
@@ -209,7 +209,7 @@ void mjCCache::Delete(mjCAsset* asset, const std::string& skip) {
   for (auto& reference : asset->References()) {
     if (reference != skip) {
       models_[reference].erase(asset);
-     }
+    }
   }
   lookup_.erase(asset->Id());
 }