Center new service window

[arjitc]

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What changed,

Small UI fix/change to fix the width of the services form,

Before:

After:

[murrant]

I would think adding col-sm-offset-3 would be a better fix.

[librenms-bot]

This pull request has been mentioned on LibreNMS Community. There might be relevant details there:

https://community.librenms.org/t/21-8-0-changelog/16685/1