Fixed CHANNEL in ESPNow example (#7104)

Co-authored-by: NVojtěch Bartoška <76958047+VojtechBartoska@users.noreply.github.com>
Co-authored-by: NJan Procházka <90197375+P-R-O-C-H-Y@users.noreply.github.com>

libraries/ESP32/examples/ESPNow/Basic/Master/Master.ino

@@ -34,7 +34,7 @@
 
 // Global copy of slave
 esp_now_peer_info_t slave;
-#define CHANNEL 3
+#define CHANNEL 1
 #define PRINTSCANRESULTS 0
 #define DELETEBEFOREPAIR 0