[JS] - When defaulting do not merge objects

[kaushlakers]

Problem
When we set the config version 3 as default we broke v2 counting because we merge the passed in config with the default config. Now since emojiParsingEnabled is a new field, when we merge objects with the default config, it is always enabled

Solution
Don't merge configs. Only set to default it if we don't have anything in the config

Result
After the 3.0 release, v2 counting was broken. Now it will work again if it is explicitly passed.

Misc Changes:

• Explicitly remove some files that were supposed to be deleted in the 3.0 commit. They stayed around because of the github merges missing files in your commit.