Make the gRPC wrappers for sa.GetCertificate and sa.GetPrecertificate bare passthroughs. The latter of these already took and returned appropriate protobufs, so this change mostly just makes the former look like the latter. Part of #5532  | 
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| test | ||
| jose.go | ||
| jose_test.go | ||
| wfe.go | ||
| wfe_test.go | ||