Timepicker with min-time and increment-minutes allows hours with no available minutes to be selected

[philnee]

Overview of the problem

Buefy version: 0.8.2
Vuejs version: 2.6.10
OS/Browser Chrome version 76.0.3809.100

Description

If a timepicker with increment-minutes and a min-time is set, can lead to being able to select an hour even through there are no available minutes to be selected for that hour

Steps to reproduce

CodePen https://codepen.io/philnee/pen/qBWqGGJ

1. Create a timepicker with increment-minutes set to 10 and min-time set to 10:55
2. Select the hour 10 from the timepicker
3. All minutes values are disabled

Expected behavior

I would have expected in this scenario that the hour 10 is disabled and the first hour available was 11 as the earliest valid time would be 11:00

Actual behavior

The user can still select 10, however then cannot complete the time as no valid minutes options are available.

I will try and submit a PR later on to fix the issue