fix: do not show warning for format differences in templates

[DimitarTachev]

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-dev-webpack/blob/master/CONTRIBUTING.md#testing-locally-by-running-e2e-tests
• Tests for the changes are included.

What is the current behavior?

When you add a new line at the end of your webpack.config or tsconfig.tns.json, the postinstall will show a warning that your configs are outdated.

What is the new behavior?

The whitespace changes are ignored during the comparison.
[CLA]: http://www.nativescript.org/cla

[DimitarTachev]

test