datetime widget time picker does not accept any valid input

**Describe the bug**
The datetime widget in time picker mode does not accept any valid input

**To Reproduce**

1. Create a datetime widget with time_format=true
2. Try to type in a time

The hours field should fill in, then upon entering the next digit, the whole widget clears

**Expected behavior**
You should be able to enter a time

**Screenshots**
Example trying to enter the time 05:30

Input: "05"

Input: "053"

**Applicable Versions:**
decap-cms-app 3.1.10
decap-cms-core 3.3.6
decap-cms 3.1.10
- Git Provider: Gitlab
- OS: Win10
- Firefox

**CMS configuration**
```
backend:
name: git-gateway
branch: main

site_url: redacted

publish_mode: editorial_workflow

# Media
media_folder: static/assets/uploads
public_folder: /assets/uploads

# File Routes
collections:
- label: Events
label_singular: Event
name: events
folder: src/lib/site/pages/events
path: "{{slug}}"
slug: "{{slug}}"
preview_path: "events/{{slug}}"
create: true
editor:
preview: false
fields:
- label: Layout
name: layout
widget: hidden
default: blocks
- label: Title
name: title
widget: string
hint: Sets the page title in browsers and search engines
- label: Description
name: description
widget: text
hint: Gives the page a description in SEO for search engines
- label: Start Date
name: startDate
widget: datetime
date_format: YYYY-MM-DD
picker_utc: true
- label: End Date
name: endDate
widget: datetime
date_format: YYYY-MM-DD
required: false
picker_utc: true
default: ""
- label: Start Time
name: startTime
widget: datetime
time_format: true
required: false
picker_utc: true
default: ""
- label: End Time
name: endTime
widget: datetime
time_format: true
required: false
picker_utc: true
default: ""
- label: All Day?
name: allDay
widget: boolean
hint: If set, events will not display a time.
default: false
- label: Tags
name: tags
widget: list
```