init plugins before gui. register wallet types in plugin constructor

plugins/virtualkeyboard.py

@@ -11,7 +11,9 @@ class Plugin(BasePlugin):
     def description(self):
         return '%s\n%s' % (_("Add an optional virtual keyboard to the password dialog."), _("Warning: do not use this if it makes you pick a weaker password."))
 
-    def init(self):
+    @hook
+    def init_qt(self, gui):
+        self.gui = gui
         self.vkb = None
         self.vkb_index = 0