RFR (XS): 8080471: fix usage of replace and file separator in Nashorn tests

[Michael Haupt]

Dear all,

please review and sponsor this fix.
Webrev: http://cr.openjdk.java.net/~mhaupt/8080471/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8080471

It fixes usages of replace and a field name type in two Nashorn tests.

Thanks,

Michael

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