This fixes an issue in WasmScript::ClearBreakPoint, which is was still removing
breakpoints in the interpreter, even when debugging in Liftoff.
The existing test inspector/debugger/wasm-stepping-liftoff.js does not require
any changes.

Change-Id: I5c60839ffde91cdd11d9f808a3102f2cc1324087
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2136872Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Paolo Severini <paolosev@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#67065}