fix: add changed file name in logs when tns preview command is executed

[Fatme]

‘tns preview’ + scan QR

Change something in *.js file and missing name of the changed file in console.

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PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/nativescript-cli/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• Tests for the changes are included.

What is the current behavior?

The changed file's name is not shown in logs when tns preview command is executed

What is the new behavior?

The changed file's name is shown in logs when tns preview command is executed