Gatwick (EGKK) SMR changes for accuracy

# What are the suggested changes?
Final ER RET alignment changed from AIP SUP. SMR updated from photo imagery.

# Sources

<img width="1247" height="796" alt="Image" src="https://github.com/user-attachments/assets/05667cf9-4ed3-4698-988e-f210f7c189b2" />