Fix -Wdeprecated-copy warnings

clang-14 has a new warning for deprecated implicit copy/assignment
if the other is written.

https://clang.llvm.org/docs/DiagnosticsReference.html#wdeprecated-copy

Change-Id: Iaeb23b2470ffa0be1953d1aed31bf0423c589893
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/435880
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed