making all header guards the same format

groundStation/src/backend/callbacks.h

groundStation/src/backend/cb_default.h

groundStation/src/backend/commands.h

groundStation/src/backend/communication.h

groundStation/src/backend/config.h

groundStation/src/backend/logger.h

groundStation/src/backend/type_def.h

groundStation/src/cli/cli.h

groundStation/src/cli/cli_getimu.h

groundStation/src/cli/cli_getpid.h

groundStation/src/cli/cli_monitor.h

groundStation/src/cli/cli_setpid.h

groundStation/src/cli/cli_setsetpoint.h

groundStation/src/frontend/frontend_common.h

groundStation/src/frontend/frontend_getimu.h

groundStation/src/frontend/frontend_getpid.h

groundStation/src/frontend/frontend_setpid.h

groundStation/src/frontend/frontend_setsetpoint.h

groundStation/src/frontend/frontend_tracker.h

groundStation/src/frontend/pid_common.h