RFR 8172214: typo in 'intersection types in cast are not supported' message

[Liam Miller-Cushon]

This fixes a typo in
compiler.err.intersection.types.in.cast.not.supported.in.source, which
incorrectly refers to default methods instead of intersection types in cast.

Bug: https://bugs.openjdk.java.net/browse/JDK-8172214
Webrev: http://cr.openjdk.java.net/~cushon/8172214/webrev.00/
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