[fnWifi] fixes #1010 force channel bitmap to scan all wifi channels. (#1011)

Author: tschak909

lib/hardware/fnWiFi.cpp

@@ -315,7 +315,9 @@ uint8_t WiFiManager::scan_networks(uint8_t maxresults)
     scan_conf.scan_type = WIFI_SCAN_TYPE_ACTIVE;
     scan_conf.scan_time.active.min = 100; // ms; 100 is what Arduino-ESP uses
     scan_conf.scan_time.active.max = 300; // ms; 300 is what Arduino-ESP uses
-
+    scan_conf.channel_bitmap.ghz_2_channels = 0xFFFF; // all channels
+    scan_conf.channel_bitmap.ghz_5_channels = 0xFFFFFFFF; // all channels
+    
     bool temporary_disconnect = false;
     uint16_t result = 0;
     uint8_t final_count = 0;