[flang] Temporarily disable part of data01 test

`data x /a(1)/` is ambiguous. The data value may be an array element
or a structure constructor. We need to parse it as one of these and
then fix up the parse tree when it should have been the other one.

My PR 1012 changed the parser to identify this as an array element.
That makes this test invalid until we have the right parse tree fixup,
so I am disabling it for now.

Original-commit: flang-compiler/f18@72aa278f0341f345a12fcd76a6ad1f2045ecc233
Reviewed-on: https://github.com/flang-compiler/f18/pull/1013