sweet: disable get subcommand on wasm

This depends on LUCI libraries which don't build on Wasm.

I don't expect anyone to be running the Sweet tool under Wasm.

Fixes #74517.
Fixes #74518.

Change-Id: I80766e091ba986f35100b0fe995eb39e6b1a07b0
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/689197
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
3 files changed