Fix IOE thrown when 'UseStringProtoEnumValueNames' enabled#61

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mainHavret/Protobuf.System.Text.Json:mainfrom

InvalidOperationException-when-'UseStringProtoEnumValueNames'-enabledHavret/Protobuf.System.Text.Json:InvalidOperationException-when-'UseStringProtoEnumValueNames'-enabledCopy head branch name to clipboard