DefaultEngine.ini restored after deleting does not match the originally generated DefautlEngine.ini

Regenerated DefaultEngine.ini should regenerate with D3D12 RHI not D3D11 RHI which would match the original generation of the file.

4.27 is  generated with D3D11 and regenerated with D3D12. 

1. Create a new Blank Project 
2. Run the console command r.RHI.Name cvar
3. Check the output log to confirm it reported "Running on the D3D12 RHI"
4. Close the editor
5. Navigate to the project's directory ../Unreal Projects/<ProjectName>/Config
6. Delete the DefaultEngine.ini
7. Reopen the project
8. Run the console command r.RHI.Name cvar
9. Check the output log

Expected Results:
"Running on the D3D12 RHI" should be reported in the output log

Actual Results:
"Running on the D3D11 RHI" is reported.