LiveCoding fails when DynamicDebugging is enabled

If DynamicDebugging is enabled, the output extension in the LiveCoding manifest is ".alt.dll", but the actual built DLL does not include ".alt" in its name.
This mismatch causes an error.

1. setup DynamicDebugging for a project
2. build the project and launch editor
3. Modify some c++ source files in your project
4. Press Ctrl + Alt + F11 to trigger LiveCoding

Result:

Reloading fails with error : 

The module 'D:\YourProject\Binaries\Win64\UnrealEditor-YourProject.alt.dll' has not been loaded by any process. Changes will be ignored.