fix(tools): apply same J1 motor reversal fix to udp_control.py

tools/udp_control.py had its own to_udp_message() that was missed in previous fixes.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

tools/udp_control.py

@@ -103,7 +103,7 @@ class ArmJointState:
 
     def to_udp_message(self) -> bytes:
         return (
-            f"JXB:{self.height}:{self.j2}:{self.j3}:{self.j4}:"
+            f"JXB:{-self.height - 290}:{self.j2}:{self.j3}:{self.j4}:"
             f"{self.j5}:{self.j6}:0:0:EZHY\n"
         ).encode("utf-8")