fix: do not set default host to localhost

[thetutlage]

Fixes bug introduced by #9912

By default the Node.js server listens on the 0.0.0.0 host. However, the related PR changes the host to localhost and hence resulted in an unwanted breaking change. This PR reverts the default value assignment and let Node.js decide the host when not explicitly specified.

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[olivermrbl]

/snapshot-this