Merge pull request #4273 from esenapaj/Fix-for-the-PR-#4256

Fix for the PR #4256 (Additional tweaks for HOTENDS == 1)

Marlin/configuration_store.cpp

 
   #if ENABLED(PIDTEMP)
     #if ENABLED(PID_PARAMS_PER_HOTEND)
-      HOTEND_LOOP
+      HOTEND_LOOP()
     #else
       int e = 0; UNUSED(e); // only need to write once
     #endif