Blacklist compares mixed case with lower case

[Helium314]

DejaVu/app/src/main/java/org/fitchfamily/android/dejavu/RfEmitter.java

Line 611 in e54aae2

final String lc = note.toLowerCase(Locale.US);

and

DejaVu/app/src/main/java/org/fitchfamily/android/dejavu/RfEmitter.java

Line 686 in e54aae2

lc.contentEquals("CDWiFi") || // WLAN network on Czech railways

results in "CDWiFi" being compared to "cdwifi" when the entry should match, so this entry is useless (applies to others as well).

Proposed solution:
only use lowercase when comparing with lc.