Display durations in a consistent manner

Fixes #61

games/models.py

@@ -114,7 +114,7 @@ class Session(models.Model):
         return timedelta(seconds=(manual + calculated).total_seconds())
 
     def duration_formatted(self) -> str:
-        result = format_duration(self.duration_seconds(), "%H:%m")
+        result = format_duration(self.duration_seconds(), "%02.0H:%02.0m")
         return result
 
     @property

games/views.py

@@ -101,8 +101,8 @@ def view_game(request, game_id=None):
     context["sessions"] = Session.objects.filter(
         purchase__edition__game_id=game_id
     ).order_by("-timestamp_start")
-    context["total_hours"] = int(
-        format_duration(context["sessions"].total_duration_unformatted(), "%H")
+    context["total_hours"] = float(
+        format_duration(context["sessions"].total_duration_unformatted(), "%2.1H")
     )
     context["session_average"] = round(
         (context["total_hours"]) / int(context["sessions"].count()), 1