fix: Sanitize given api_host urls to not have a trailing slash

[benjackwhite]

Changes

A user had issues loading the recorder.js and this was down to a trailing slash in the api_host.

We always expect it to be without the trailing slash so this change ensures that.

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers

[github-actions]

Size Change: +240 B (0%)

Total Size: 745 kB

Filename	Size	Change
dist/array.full.js	176 kB	+60 B (0%)
dist/array.js	118 kB	+60 B (0%)
dist/es.js	118 kB	+60 B (0%)
dist/module.js	118 kB	+60 B (0%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	12 kB
dist/recorder-v2.js	104 kB
dist/recorder.js	58.4 kB
dist/surveys.js	41.5 kB

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