fix(secubox-p2p): Remove invalid 'local' in case statement

BusyBox ash doesn't support 'local' keyword outside functions.
This was causing health_check RPC to hang with no response.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package/secubox/secubox-p2p/root/usr/libexec/rpcd/luci.secubox-p2p

@@ -208,9 +208,9 @@ EOF
 				;;
 
 			health_check)
-				local peers_online=0
-				local peers_total=0
-				local services_running=0
+				peers_online=0
+				peers_total=0
+				services_running=0
 
 				# Count online peers
 				if [ -f /tmp/secubox-p2p-peers.json ]; then