Cleanup: avoid using context in versioning code

Also extract versioning into a function that makes it's purpose clear.

release/scripts/startup/bl_app_templates_system/Video_Editing/__init__.py

@@ -20,10 +20,8 @@ import bpy
 from bpy.app.handlers import persistent
 
 
-@persistent
-def load_handler(_):
-    from bpy import context
-    screen = context.screen
+def do_version_file_browser():
+    screen = bpy.data.screens["Video Editing"]
     for area in screen.areas:
         if area.type == 'FILE_BROWSER':
             space = area.spaces.active
@@ -31,6 +29,11 @@ def load_handler(_):
             params.use_filter_folder = True
 
 
+@persistent
+def load_handler(_):
+    do_version_file_browser()
+
+
 def register():
     bpy.app.handlers.load_factory_startup_post.append(load_handler)