Fix the changed structure of the input file (#5891)

The input file containing certificates has changed.

Author: JiriBilek

libraries/ESP8266WiFi/examples/BearSSL_CertStore/certs-from-mozilla.py

@@ -30,7 +30,7 @@
 csvReader = csv.reader(StringIO(csvData))
 for row in csvReader:
     names.append(row[0]+":"+row[1]+":"+row[2])
-    pems.append(row[28])
+    pems.append(row[30])
 del names[0] # Remove headers
 del pems[0] # Remove headers