add missing public keyword

mission/devices/SolarArrayDeploymentHandler.h

@@ -23,7 +23,7 @@
 
 enum DeploymentChannels : uint8_t { SA_1 = 1, SA_2 = 2 };
 
-class ManualDeploymentCommand : SerialLinkedListAdapter<SerializeIF> {
+class ManualDeploymentCommand : public SerialLinkedListAdapter<SerializeIF> {
  public:
   ManualDeploymentCommand() = default;