Disable i2797 again

While the test now succeeds under separate compilation, it fails join
compilation (which happens to be tested by the legacy tests currently),
you can reproduce that by running:
dotc tests/pending/pos/i2797/Fork_1.java tests/pending/pos/i2797/Test_2.scala

This fails with:
-- Error: tests/pending/pos/i2797/Test_2.scala:4:0 -------------------------------------
4 |@Fork_1(jvmArgs = Array("I'm", "hot"))
  |^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |missing argument for parameter value of constructor Fork_1: (value:
  |Int, jvmArgs: Array[String]): Fork_1

Because the JavaParsers output a constructor for Fork_1 without default
values, to fix this we need JavaParsers to do something similar to
ClassfileParser#addAnnotationConstructor

Author: smarter