Fix boolean configuration choices

Since the ask_bool refactoring, boolean choices were no longer taken
into account during interactive configuration.

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Latest
+
+- [Bugfix] Fix boolean configuration choices
+
 ## 3.3.9 (2019-05-13)
 
 - [Improvement] Add `local exec` command for running commands inside existing containers

tutor/config.py

@@ -260,7 +260,7 @@ def load_interactive(config):
     ask_bool(
         (
             "Activate SSL/TLS certificates for HTTPS access? Important note:"
-            "this will NOT work in a development environment."
+            " this will NOT work in a development environment."
         ),
         "ACTIVATE_HTTPS",
         config,
@@ -298,7 +298,9 @@ def ask(question, key, config):
 
 
 def ask_bool(question, key, config):
-    return click.confirm(fmt.question(question), prompt_suffix=" ", default=config[key])
+    config[key] = click.confirm(
+        fmt.question(question), prompt_suffix=" ", default=config[key]
+    )
 
 
 def ask_choice(question, key, config, choices):