[pygobject] Gtk.Template: Remove init_template() from instance, not class

[Christoph Reiter <creiter src gnome org>]

commit 05c3b8dc91f5d51bd30bbe58963a4454b447b707
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Jul 7 07:24:39 2018 +1000

    Gtk.Template: Remove init_template() from instance, not class
    
    Without this change, the second instantiation of any templated class
    will fail to run any of the actual template-handling logic.
    
    This is *only* relevant when using the _gtk_template helpers with an
    older PyGObject; in newer versions, this method isn't called.

 gi/_gtktemplate.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gi/_gtktemplate.py b/gi/_gtktemplate.py
index df9afdbd..a345f5d2 100644
--- a/gi/_gtktemplate.py
+++ b/gi/_gtktemplate.py
@@ -99,7 +99,7 @@ def register_template(cls):
 
 
 def init_template(self, cls, base_init_template):
-    cls.init_template = lambda s: None
+    self.init_template = lambda s: None
 
     if self.__class__ is not cls:
         raise TypeError(