[AIRFLOW-4148] Fix editing DagRuns when clicking state column (apache…

…#5436)

The update from Flask-Admin to 1.5.2 broke editing the state by clicking
on the column. This makes it work again (although the edited column is
no-longer styled once edited). This is good enough a fix for the
deprecated UI

(Authorship and commit taken from apache#4969)

airflow/www/views.py

@@ -2684,7 +2684,7 @@ class DagRunModelView(ModelViewOnly):
     verbose_name = "dag run"
     column_default_sort = ('execution_date', True)
     form_choices = {
-        'state': [
+        '_state': [
             ('success', 'success'),
             ('running', 'running'),
             ('failed', 'failed'),