Add some forgotten selfs

sdcard/rootfs/root/pwnagotchi/scripts/pwnagotchi/voice.py

@@ -37,11 +37,11 @@ class Voice:
             '...'])
 
 
-    def on_free_channel(channel):
+    def on_free_channel(self, channel):
         return self._('Hey, channel {channel} is\nfree! Your AP will\nsay thanks.').format(channel=channel)
 
 
-    def on_bored():
+    def on_bored(self):
         return random.choice([ \
             self._('I\'m bored ...'),
             self._('Let\'s go for a walk!')])