test: Santise output from GraalVM's lambda names
test: Santise output from GraalVM's lambda names

I ran a few tests on GraalVM (`--grep repl`) and the following had
different lambda names:

    run/repl-parens.scala
    run/t5789.scala
    run/t5535.scala
    run/repl-no-imports-no-predef.scala
    run/t7747-repl.scala
    run/t6434.scala

It looks like GraalVM's lambdas use a hex-formatted identifier instead
of decimal, so I made the minimal change to the test sanitisation to
handle those.

scala/scala,scala/scala,lrytz/scala,scala/scala,scala/scala,lrytz/scala,scala/scala,scala/scala,lrytz/scala,lrytz/scala,lrytz/scala,lrytz/scala