fix(debugger-app): use `fileURLToPath` to get path of url

[meypod]

use fileURLToPath function to get path of URL instead of .pathname (added in v10.12.0)

fixes #219

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Latest commit: 24e1e5d09f9a575e19c4f79963996a577166336a

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[meypod]

Hi @jbinda can you take a look ? I did what you requested

[jbinda]

@meypod - thank for rebasing !