move init_qt hook

lib/plugins.py

@@ -168,8 +168,6 @@ class BasePlugin:
         self.set_enabled(False)
         return True
 
-    def init_qt(self, gui): pass
-
     @hook
     def load_wallet(self, wallet, window): pass
 

plugins/audio_modem.py

@@ -35,6 +35,10 @@ class Plugin(BasePlugin):
                 'Linux': 'libportaudio.so'
             }[platform.system()]
 
+    @hook
+    def init_qt(self, gui):
+        pass
+
     def is_available(self):
         return amodem is not None