html/template: use maps.Copy in escaper.escapeListConditionally
To make it a little simpler.
Change-Id: I0d7f015e8f245fbdd8c5cf5c10e8d2bd44b91021
GitHub-Last-Rev:
2eae47fe8bc5704de86a91ac87c76e49f51d2fe7
GitHub-Pull-Request: golang/go#69396
Reviewed-on: https://go-review.googlesource.com/c/go/+/612397
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Tim King <taking@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>