[wpilibc] Use default copies and moves when possible (#3381)

The removal of ErrorBase allowed the defaults to be used in more places.

wpilibNewCommands/src/main/native/cpp/frc2/command/Command.cpp

@@ -21,8 +21,6 @@ Command::~Command() {
   CommandScheduler::GetInstance().Cancel(this);
 }
 
-Command::Command(const Command& rhs) = default;
-
 Command& Command::operator=(const Command& rhs) {
   m_isGrouped = false;
   return *this;