Fix minor typo around default channel key

app/src/main/java/com/geeksville/mesh/model/Channel.kt

@@ -20,7 +20,7 @@ data class Channel(
         // Note: this string _SHOULD NOT BE LOCALIZED_ because it directly hashes to values used on the device for the default channel name.
         val defaultChannelName = "Default"
 
-        // These bytes must math the well known and not secret bytes used the default channel AES128 key device code
+        // These bytes must match the well known and not secret bytes used the default channel AES128 key device code
         val channelDefaultKey = byteArrayOfInts(
             0xd4, 0xf1, 0xbb, 0x3a, 0x20, 0x29, 0x07, 0x59,
             0xf0, 0xbc, 0xff, 0xab, 0xcf, 0x4e, 0x69, 0xbf