Fix movement transition issue.

When transitioning the movements directly the channel should be stopped first.

src/relay_chn.c

@@ -490,6 +490,9 @@ static void relay_chn_issue_cmd(relay_chn_t* relay_chn, relay_chn_cmd_t cmd)
                 return;
             }
             
+            // Stop the channel first before the schedule
+            relay_chn_dispatch_cmd(relay_chn, RELAY_CHN_CMD_STOP);
+
             // If the last run command is different from the current command, wait for the opposite inertia time
             relay_chn->pending_cmd = cmd;
             relay_chn_state_t new_state = cmd == RELAY_CHN_CMD_FORWARD