Remove init_qt hook for virtkeyboard plugin

plugins/virtualkeyboard.py

@@ -5,11 +5,8 @@ import random
 
 class Plugin(BasePlugin):
 
-    @hook
-    def init_qt(self, gui):
-        self.gui = gui
-        self.vkb = None
-        self.vkb_index = 0
+    vkb = None
+    vkb_index = 0
 
     @hook
     def password_dialog(self, pw, grid, pos):
@@ -61,4 +58,3 @@ class Plugin(BasePlugin):
         vbox.addLayout(grid)
 
         return vbox
-