If script is not disassembled, still use the same script URL format for
consistency.

In particular, use an absolute `wasm://wasm/` prefix, like disassembled fake
scripts do, instead of just a script name which appears to be a
relative URL to devtools.

Change-Id: Ib7632f9f3587ca4961eb4f0b884482b3a1a6e1f0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1833685Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Ingvar Stepanyan <rreverser@google.com>
Cr-Commit-Position: refs/heads/master@{#64086}