fix(toggleterm-manager-nvim): fix terminal selection in insert mode

[refLog2112]

📑 Description

ℹ Additional Information

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Review Checklist

Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

Proper conventional commit scoping:

• If you are adding a new plugin, the scope would be the name of the category it is being added into. ex. feat(utility): added noice.nvim plugin

• If you are modifying a pre-existing plugin or pack, the scope would be the name of the plugin folder. ex. fix(noice-nvim): fix LSP handler error

• [ ] Pull request title has the appropriate conventional commit type and scope where the scope is the name of the pre-existing directory in the project as described above

• [ ] README is properly formatted and uses fenced in links with <url> unless they are inside a [title](url)

• [ ] Proper usage of opts table rather than setting things up with the config function.