Changes made to lex-web-ui-loader-config.json are being overwritten by default-lex-web-ui-loader-config.json

[alytle]

When making configuration changes, the file default-lex-web-ui-loader-config.json seems to take precedence over lex-web-ui-loader-config.json, even for keys which are explicitly defined in the former.

For example, I wanted to enable the saveHistory feature, but when I edited src/config/lex-web-ui-loader-config.json the changes did not take effect. Once I made the change to the src/config/default-lex-web-ui-loader-config.json the change took effect. The default file had the value set to false, which seems to take over.

This has been reproduced in the CodePipeline/CodeBuild deployment model only.